<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:60bd53fb-4ce8-48f2-aaeb-af12e913c785,g:693ce320-0cfb-4142-9d51-e780ece74c38-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.mandg.com/role/StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement" xlink:type="simple" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement"/>
  <link:calculationLink xlink:role="http://www.mandg.com/role/StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_64765a91-7a90-427f-8aae-189797d7d823" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_c840f8c2-45dd-480a-8a18-8caa40429294" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLoss_64765a91-7a90-427f-8aae-189797d7d823" xlink:to="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_c840f8c2-45dd-480a-8a18-8caa40429294" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_4963db9c-f6a0-4f80-8b75-62041337c7a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLoss_64765a91-7a90-427f-8aae-189797d7d823" xlink:to="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_4963db9c-f6a0-4f80-8b75-62041337c7a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentIncome_138f74b8-60de-464d-8833-145649de5335" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_fc861def-4c45-40aa-a437-d5135f5ede96" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InvestmentIncome_138f74b8-60de-464d-8833-145649de5335" xlink:to="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_fc861def-4c45-40aa-a437-d5135f5ede96" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherFinanceIncomeCost_5ff3fa30-8d8d-483d-a3a3-34d1a64904d8" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherFinanceIncomeCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InvestmentIncome_138f74b8-60de-464d-8833-145649de5335" xlink:to="loc_ifrs-full_OtherFinanceIncomeCost_5ff3fa30-8d8d-483d-a3a3-34d1a64904d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestIncomeForFinancialAssetsNotAtFairValueThroughProfitOrLoss_c50dfea4-a8b6-40bc-b8a4-34f08878f19a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestIncomeForFinancialAssetsNotAtFairValueThroughProfitOrLoss"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InvestmentIncome_138f74b8-60de-464d-8833-145649de5335" xlink:to="loc_ifrs-full_InterestIncomeForFinancialAssetsNotAtFairValueThroughProfitOrLoss_c50dfea4-a8b6-40bc-b8a4-34f08878f19a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss_64571188-0b6b-46f6-b9c1-5f35be626471" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InvestmentIncome_138f74b8-60de-464d-8833-145649de5335" xlink:to="loc_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss_64571188-0b6b-46f6-b9c1-5f35be626471" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EffectOnAdjustmentToContractualServiceMarginOfChoiceNotToAdjustContractualServiceMarginForSomeChangesInFulfilmentCashFlowsForContractsWithDirectParticipationFeatures_afb996e5-608f-43b1-90bd-d2ca146328b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EffectOnAdjustmentToContractualServiceMarginOfChoiceNotToAdjustContractualServiceMarginForSomeChangesInFulfilmentCashFlowsForContractsWithDirectParticipationFeatures"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InvestmentIncome_138f74b8-60de-464d-8833-145649de5335" xlink:to="loc_ifrs-full_EffectOnAdjustmentToContractualServiceMarginOfChoiceNotToAdjustContractualServiceMarginForSomeChangesInFulfilmentCashFlowsForContractsWithDirectParticipationFeatures_afb996e5-608f-43b1-90bd-d2ca146328b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRevenueExpense_edd2f41d-a5c7-4fed-b529-8b8b95b870d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestRevenueExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldRecognisedInProfitOrLoss_fdbb0a66-69a5-49dd-85a4-6fb27d254ba6" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldRecognisedInProfitOrLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InterestRevenueExpense_edd2f41d-a5c7-4fed-b529-8b8b95b870d4" xlink:to="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldRecognisedInProfitOrLoss_fdbb0a66-69a5-49dd-85a4-6fb27d254ba6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedRecognisedInProfitOrLoss_7c37278e-b1c5-4a48-88f1-f2e94f4503c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedRecognisedInProfitOrLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InterestRevenueExpense_edd2f41d-a5c7-4fed-b529-8b8b95b870d4" xlink:to="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedRecognisedInProfitOrLoss_7c37278e-b1c5-4a48-88f1-f2e94f4503c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost_9256f4b4-93d4-4e0a-aad6-a10c1c778927" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceServiceResult_6ac1889e-2a88-435a-9548-96759662e4a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceServiceResult"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_FinanceIncomeCost_9256f4b4-93d4-4e0a-aad6-a10c1c778927" xlink:to="loc_ifrs-full_InsuranceServiceResult_6ac1889e-2a88-435a-9548-96759662e4a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentIncome_553329e2-e2b5-406f-b02f-0704c82ef7b7" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_FinanceIncomeCost_9256f4b4-93d4-4e0a-aad6-a10c1c778927" xlink:to="loc_ifrs-full_InvestmentIncome_553329e2-e2b5-406f-b02f-0704c82ef7b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRevenueExpense_bf36a0c1-543b-4a69-938a-ab2ab6d623cd" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestRevenueExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_FinanceIncomeCost_9256f4b4-93d4-4e0a-aad6-a10c1c778927" xlink:to="loc_ifrs-full_InterestRevenueExpense_bf36a0c1-543b-4a69-938a-ab2ab6d623cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceServiceResult_93da2f39-6566-4413-9193-e93c430a675e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceServiceResult"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued_3584c434-2253-46aa-8ca9-b40e0e39f34d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InsuranceServiceResult_93da2f39-6566-4413-9193-e93c430a675e" xlink:to="loc_ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued_3584c434-2253-46aa-8ca9-b40e0e39f34d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceRevenue_f7fc7dc6-6593-4fbb-ac7c-93ea3fa270d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceRevenue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InsuranceServiceResult_93da2f39-6566-4413-9193-e93c430a675e" xlink:to="loc_ifrs-full_InsuranceRevenue_f7fc7dc6-6593-4fbb-ac7c-93ea3fa270d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses_5b7c54e4-8088-4c62-b088-06584f54343b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_InsuranceServiceResult_93da2f39-6566-4413-9193-e93c430a675e" xlink:to="loc_ifrs-full_IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses_5b7c54e4-8088-4c62-b088-06584f54343b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_TaxChargecreditAttributableToEquityHolders_7e7b1c87-4690-4010-a7b5-5c9e859f518f" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_TaxChargecreditAttributableToEquityHolders"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_LessTaxChargecreditAttributableToPolicyholdersReturns_25d3c8f6-3ea2-4981-be8a-786d5b61723c" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_LessTaxChargecreditAttributableToPolicyholdersReturns"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mgplc_TaxChargecreditAttributableToEquityHolders_7e7b1c87-4690-4010-a7b5-5c9e859f518f" xlink:to="loc_mgplc_LessTaxChargecreditAttributableToPolicyholdersReturns_25d3c8f6-3ea2-4981-be8a-786d5b61723c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_d5163817-6dde-4cc9-afd8-8b18466fe69e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mgplc_TaxChargecreditAttributableToEquityHolders_7e7b1c87-4690-4010-a7b5-5c9e859f518f" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_d5163817-6dde-4cc9-afd8-8b18466fe69e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_0cfde59e-7533-4531-babc-d2bfed6a14db" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_0cfde59e-7533-4531-babc-d2bfed6a14db" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIncome_06f65e20-b563-4ac7-a2cb-6583b0a1e8fa" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherIncome"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:to="loc_ifrs-full_OtherIncome_06f65e20-b563-4ac7-a2cb-6583b0a1e8fa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FeeAndCommissionIncome_9fbe1ebd-0f1e-4130-b86d-5567ddf97f55" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FeeAndCommissionIncome"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:to="loc_ifrs-full_FeeAndCommissionIncome_9fbe1ebd-0f1e-4130-b86d-5567ddf97f55" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost_c4ca8d36-dc60-454a-8a5d-cc8b3c34fdfa" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:to="loc_ifrs-full_FinanceIncomeCost_c4ca8d36-dc60-454a-8a5d-cc8b3c34fdfa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdministrativeExpense_4c88e603-c54e-4314-b9f7-d54e403f2ad4" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdministrativeExpense"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:to="loc_ifrs-full_AdministrativeExpense_4c88e603-c54e-4314-b9f7-d54e403f2ad4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts_430d51bb-25ab-4ffe-a0dd-f0fd339fdb88" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceCosts"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:to="loc_ifrs-full_FinanceCosts_430d51bb-25ab-4ffe-a0dd-f0fd339fdb88" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_MovementsInThirdPartyInterestInConsolidatedFunds_5831f748-54a3-40a7-ae88-851ddf67bdd6" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_MovementsInThirdPartyInterestInConsolidatedFunds"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_001cb402-eb1f-4c6f-8d85-cbe0fb2bccf3" xlink:to="loc_mgplc_MovementsInThirdPartyInterestInConsolidatedFunds_5831f748-54a3-40a7-ae88-851ddf67bdd6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_ProfitBeforeTaxAttributableToEquityHolders_3afe5285-9fb7-4f73-94d7-9ddbf0591546" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_ProfitBeforeTaxAttributableToEquityHolders"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_6585fa47-9689-4c1a-aa1c-d80a5d3bcf83" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mgplc_ProfitBeforeTaxAttributableToEquityHolders_3afe5285-9fb7-4f73-94d7-9ddbf0591546" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_6585fa47-9689-4c1a-aa1c-d80a5d3bcf83" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_TaxChargeAttributableToPolicyholdersReturns_b43e2029-482b-47ad-aa6d-eff5214e6e1f" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_TaxChargeAttributableToPolicyholdersReturns"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mgplc_ProfitBeforeTaxAttributableToEquityHolders_3afe5285-9fb7-4f73-94d7-9ddbf0591546" xlink:to="loc_mgplc_TaxChargeAttributableToPolicyholdersReturns_b43e2029-482b-47ad-aa6d-eff5214e6e1f" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.mandg.com/role/StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement_1" xlink:type="simple" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement_1"/>
  <link:calculationLink xlink:role="http://www.mandg.com/role/StatementofcomprehensiveincomeprofitorlossbyfunctionofexpenseStatement_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_29fe74d0-27ef-4a4d-9770-f7eacbb80e4b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_ProfitBeforeTaxAttributableToEquityHolders_efb5f0b3-6276-4d74-93f5-92d3a309ee45" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_ProfitBeforeTaxAttributableToEquityHolders"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLoss_29fe74d0-27ef-4a4d-9770-f7eacbb80e4b" xlink:to="loc_mgplc_ProfitBeforeTaxAttributableToEquityHolders_efb5f0b3-6276-4d74-93f5-92d3a309ee45" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_TaxChargecreditAttributableToEquityHolders_c0b4e2fb-f9ec-4d6b-9566-e8b75de49b55" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_TaxChargecreditAttributableToEquityHolders"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_ProfitLoss_29fe74d0-27ef-4a4d-9770-f7eacbb80e4b" xlink:to="loc_mgplc_TaxChargecreditAttributableToEquityHolders_c0b4e2fb-f9ec-4d6b-9566-e8b75de49b55" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.mandg.com/role/StatementoffinancialpositioncurrentnoncurrentStatement" xlink:type="simple" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#StatementoffinancialpositioncurrentnoncurrentStatement"/>
  <link:calculationLink xlink:role="http://www.mandg.com/role/StatementoffinancialpositioncurrentnoncurrentStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_38bb7249-634f-4cbb-8002-493b90faa9a5" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharePremium_8d8671b6-8268-47bd-8769-5139cbea79a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_SharePremium"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_38bb7249-634f-4cbb-8002-493b90faa9a5" xlink:to="loc_ifrs-full_SharePremium_8d8671b6-8268-47bd-8769-5139cbea79a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TreasuryShares_226feb61-94a1-48e3-b4aa-11875a5a19a3" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TreasuryShares"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_38bb7249-634f-4cbb-8002-493b90faa9a5" xlink:to="loc_ifrs-full_TreasuryShares_226feb61-94a1-48e3-b4aa-11875a5a19a3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarnings_a68573cf-3729-44dc-b143-2d6b190c252b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarnings"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_38bb7249-634f-4cbb-8002-493b90faa9a5" xlink:to="loc_ifrs-full_RetainedEarnings_a68573cf-3729-44dc-b143-2d6b190c252b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_SharesHeldByEmployeeBenefitTrust_81d0ed70-1a4b-4cfa-a047-5eac087732f6" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_SharesHeldByEmployeeBenefitTrust"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_38bb7249-634f-4cbb-8002-493b90faa9a5" xlink:to="loc_mgplc_SharesHeldByEmployeeBenefitTrust_81d0ed70-1a4b-4cfa-a047-5eac087732f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_4796cd45-b36a-4b6b-82b8-18d8ff9f1cc7" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapital"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_38bb7249-634f-4cbb-8002-493b90faa9a5" xlink:to="loc_ifrs-full_IssuedCapital_4796cd45-b36a-4b6b-82b8-18d8ff9f1cc7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReserves_a41a45a1-4ace-4f9c-9d69-606a86425581" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherReserves"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParent_38bb7249-634f-4cbb-8002-493b90faa9a5" xlink:to="loc_ifrs-full_OtherReserves_a41a45a1-4ace-4f9c-9d69-606a86425581" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_a98c210f-5d71-40b8-831f-2be7b779d9c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_a98c210f-5d71-40b8-831f-2be7b779d9c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReinsuranceContractsHeldThatAreLiabilities_d56cd593-055e-4e22-8cc8-8238bc22a907" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReinsuranceContractsHeldThatAreLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_ReinsuranceContractsHeldThatAreLiabilities_d56cd593-055e-4e22-8cc8-8238bc22a907" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Provisions_419b71ab-7146-4659-bba6-95fc3443783b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Provisions"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_Provisions_419b71ab-7146-4659-bba6-95fc3443783b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_SubordinatedLiabilitiesAndOtherBorrowings_c0ee14e7-3a20-4eb8-9a56-cd255a970bf7" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_SubordinatedLiabilitiesAndOtherBorrowings"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_mgplc_SubordinatedLiabilitiesAndOtherBorrowings_c0ee14e7-3a20-4eb8-9a56-cd255a970bf7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilities_6628b36b-17ee-4d9a-b4f9-92a15c9fc0da" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LeaseLiabilities"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_LeaseLiabilities_6628b36b-17ee-4d9a-b4f9-92a15c9fc0da" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecognisedLiabilitiesDefinedBenefitPlan_6b0294d5-d488-4a87-bf6e-738b132dec0c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RecognisedLiabilitiesDefinedBenefitPlan"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_RecognisedLiabilitiesDefinedBenefitPlan_6b0294d5-d488-4a87-bf6e-738b132dec0c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_ac913fc0-7c4c-4f64-b520-ef17a78c34a6" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceContractsIssuedThatAreLiabilities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_ac913fc0-7c4c-4f64-b520-ef17a78c34a6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_AccrualsDeferredIncomeAndOtherLiabilities_d3adfb22-5b48-4b20-83fd-9cc30a87ac78" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_AccrualsDeferredIncomeAndOtherLiabilities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_mgplc_AccrualsDeferredIncomeAndOtherLiabilities_d3adfb22-5b48-4b20-83fd-9cc30a87ac78" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilities_7b032770-bd19-4af3-ae41-7f18a5f54518" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DerivativeFinancialLiabilities"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_DerivativeFinancialLiabilities_7b032770-bd19-4af3-ae41-7f18a5f54518" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_373b8fb5-38d9-44a0-8d3c-afbc11d1f3d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxLiabilities"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_373b8fb5-38d9-44a0-8d3c-afbc11d1f3d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherFinancialLiabilities_1a37f72f-766f-4f97-ba30-a778f802b0cf" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherFinancialLiabilities"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_OtherFinancialLiabilities_1a37f72f-766f-4f97-ba30-a778f802b0cf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_ThirdPartyInterestInConsolidatedFunds_910bd1ea-8c44-422c-b0d9-47d88f4e0b14" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_ThirdPartyInterestInConsolidatedFunds"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_mgplc_ThirdPartyInterestInConsolidatedFunds_910bd1ea-8c44-422c-b0d9-47d88f4e0b14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxLiabilities_3577ff36-e850-439a-a36c-d3955cac1297" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxLiabilities"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_ifrs-full_CurrentTaxLiabilities_3577ff36-e850-439a-a36c-d3955cac1297" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_InvestmentContractLiabilitiesWithoutDiscretionaryParticipationFeatures_4a116e2b-cb42-4d7f-ab07-d6dcb552f815" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_InvestmentContractLiabilitiesWithoutDiscretionaryParticipationFeatures"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Liabilities_7144dc83-b7a9-48f5-ad75-a08387ea8adb" xlink:to="loc_mgplc_InvestmentContractLiabilitiesWithoutDiscretionaryParticipationFeatures_4a116e2b-cb42-4d7f-ab07-d6dcb552f815" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_468fcc85-d997-494b-9803-f9d0c4370903" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterests_4360ab2b-42ef-4d0e-bd61-faa5d501c61b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncontrollingInterests"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Equity_468fcc85-d997-494b-9803-f9d0c4370903" xlink:to="loc_ifrs-full_NoncontrollingInterests_4360ab2b-42ef-4d0e-bd61-faa5d501c61b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_983219d3-ea51-4624-bbb5-dab04d7e4ec6" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Equity_468fcc85-d997-494b-9803-f9d0c4370903" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParent_983219d3-ea51-4624-bbb5-dab04d7e4ec6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities_fd8d1fb3-7dc9-45ce-928b-a44702e7aa78" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_c9abeae3-8032-48d8-9dce-c7e70d48ef51" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAndLiabilities_fd8d1fb3-7dc9-45ce-928b-a44702e7aa78" xlink:to="loc_ifrs-full_Equity_c9abeae3-8032-48d8-9dce-c7e70d48ef51" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_b09e579f-8ac5-4d7c-8c10-a5a5c90f1984" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Liabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_EquityAndLiabilities_fd8d1fb3-7dc9-45ce-928b-a44702e7aa78" xlink:to="loc_ifrs-full_Liabilities_b09e579f-8ac5-4d7c-8c10-a5a5c90f1984" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_AccruedInvestmentIncomeAndOtherDebtors_60d8e023-f169-45a5-b5e7-b194bef9dea2" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_AccruedInvestmentIncomeAndOtherDebtors"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_mgplc_AccruedInvestmentIncomeAndOtherDebtors_60d8e023-f169-45a5-b5e7-b194bef9dea2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_93bbcdde-4473-492f-850d-10793139c374" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_93bbcdde-4473-492f-850d-10793139c374" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceContractsThatAreAssets_63c68474-8035-4d15-8159-4bfc48916d1c" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceContractsThatAreAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_InsuranceContractsThatAreAssets_63c68474-8035-4d15-8159-4bfc48916d1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents_f5d70ee8-7674-494c-ab34-ff90eaf1f251" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_CashAndCashEquivalents_f5d70ee8-7674-494c-ab34-ff90eaf1f251" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_5340e830-add0-462c-98b6-a1524591a3e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_5340e830-add0-462c-98b6-a1524591a3e6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_Deposits_8a498d12-b85c-4a2d-baca-9ca42697aaf7" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_Deposits"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_mgplc_Deposits_8a498d12-b85c-4a2d-baca-9ca42697aaf7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LoansAndReceivables_e6d3e99d-75a2-469f-be95-7e2f231ca269" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LoansAndReceivables"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_LoansAndReceivables_e6d3e99d-75a2-469f-be95-7e2f231ca269" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialAssets_d3d6bc6d-29ed-4e0a-92f1-915022c08448" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DerivativeFinancialAssets"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_DerivativeFinancialAssets_d3d6bc6d-29ed-4e0a-92f1-915022c08448" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredAcquisitionCostsArisingFromInsuranceContracts_2e6cbc0a-5b38-4609-96e5-df80f39f1741" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredAcquisitionCostsArisingFromInsuranceContracts"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_DeferredAcquisitionCostsArisingFromInsuranceContracts_2e6cbc0a-5b38-4609-96e5-df80f39f1741" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwill_9dc290b5-aa1b-4aef-b4fb-70a9bd36f36f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IntangibleAssetsAndGoodwill"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwill_9dc290b5-aa1b-4aef-b4fb-70a9bd36f36f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentProperty_c331d827-6404-49e3-b38e-f3e6374f2b4f" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentProperty"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_InvestmentProperty_c331d827-6404-49e3-b38e-f3e6374f2b4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReinsuranceAssets_ee2b4ce0-1e0b-4ac5-a642-820e9ef87d49" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReinsuranceAssets"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_ReinsuranceAssets_ee2b4ce0-1e0b-4ac5-a642-820e9ef87d49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityInstrumentsHeld_8f166a4c-93ce-4680-aae7-0771a5b2b383" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityInstrumentsHeld"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_EquityInstrumentsHeld_8f166a4c-93ce-4680-aae7-0771a5b2b383" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DebtInstrumentsHeld_2e9ea8aa-a1e3-4b1d-a198-871dc7c24bf3" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DebtInstrumentsHeld"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_DebtInstrumentsHeld_2e9ea8aa-a1e3-4b1d-a198-871dc7c24bf3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssets_b5777984-7aad-40e5-aa8a-bb94a119f156" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxAssets"/>
    <link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_DeferredTaxAssets_b5777984-7aad-40e5-aa8a-bb94a119f156" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxAssets_9d27b4e4-6a6c-4dfd-a4cd-ce3c22933c8e" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxAssets"/>
    <link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_CurrentTaxAssets_9d27b4e4-6a6c-4dfd-a4cd-ce3c22933c8e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_dd18ffd8-c763-41f6-a12f-90fd543ce298" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_dd18ffd8-c763-41f6-a12f-90fd543ce298" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecognisedAssetsDefinedBenefitPlan_f1ec57a6-d467-4018-abc9-f8eecae468b4" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RecognisedAssetsDefinedBenefitPlan"/>
    <link:calculationArc order="18" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_Assets_89f8b589-9cc5-4ba8-b9d5-bdcc6692dea9" xlink:to="loc_ifrs-full_RecognisedAssetsDefinedBenefitPlan_f1ec57a6-d467-4018-abc9-f8eecae468b4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.mandg.com/role/StatementofcashflowsdirectmethodStatement" xlink:type="simple" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#StatementofcashflowsdirectmethodStatement"/>
  <link:calculationLink xlink:role="http://www.mandg.com/role/StatementofcashflowsdirectmethodStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_45845c80-ffb2-4c62-935c-f8e087c855b2" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_d31172ba-322d-4a94-b72b-369847364ec4" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_45845c80-ffb2-4c62-935c-f8e087c855b2" xlink:to="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_d31172ba-322d-4a94-b72b-369847364ec4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_557af552-9d0d-484b-9b01-1ad4c2c9a68d" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_45845c80-ffb2-4c62-935c-f8e087c855b2" xlink:to="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_557af552-9d0d-484b-9b01-1ad4c2c9a68d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_d39b7b43-362b-4a09-945a-887b9097a188" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_45845c80-ffb2-4c62-935c-f8e087c855b2" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_d39b7b43-362b-4a09-945a-887b9097a188" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceIncomeCost_6a0aa2cd-ce35-4760-ad6f-b58ba2a17add" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForFinanceIncomeCost"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_AdjustmentsForFinanceIncomeCost_6a0aa2cd-ce35-4760-ad6f-b58ba2a17add" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities_d01b987d-5f70-4b59-9908-0894d7611ae2" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilities_d01b987d-5f70-4b59-9908-0894d7611ae2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsReceivedClassifiedAsOperatingActivities_c0df9a2e-90f5-41e7-b023-e5ae4800b3de" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsReceivedClassifiedAsOperatingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_DividendsReceivedClassifiedAsOperatingActivities_c0df9a2e-90f5-41e7-b023-e5ae4800b3de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_34caef15-c878-4ed8-ac0e-7c7a7165681a" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherLiabilities_34caef15-c878-4ed8-ac0e-7c7a7165681a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_AdjustmentsForInvestments_553d3610-3dfa-495d-9fb1-297e640e94ff" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_AdjustmentsForInvestments"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_mgplc_AdjustmentsForInvestments_553d3610-3dfa-495d-9fb1-297e640e94ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInContractLiabilities_508abbd6-2512-400b-bf37-0409e7cc8fe2" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInContractLiabilities"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInContractLiabilities_508abbd6-2512-400b-bf37-0409e7cc8fe2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_92d7bffe-dc10-4ecc-a8b9-f028b1523880" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_92d7bffe-dc10-4ecc-a8b9-f028b1523880" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_cf9b319c-75b5-4246-8010-312f71580846" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestReceivedClassifiedAsOperatingActivities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_cf9b319c-75b5-4246-8010-312f71580846" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets_c8024082-d8a3-4f62-846c-d89e4b2652b6" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets_c8024082-d8a3-4f62-846c-d89e4b2652b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_7dcd6357-a2e9-427d-90b3-e53b41008931" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_7dcd6357-a2e9-427d-90b3-e53b41008931" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_11d9e9e7-ae5f-4d3f-aca1-8adfa909c843" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_11d9e9e7-ae5f-4d3f-aca1-8adfa909c843" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherAdjustmentsForNoncashItems_5c792cb9-426d-4813-a124-de183b58ffdd" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherAdjustmentsForNoncashItems"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_a24d7d2f-5a88-4719-9963-7c5e2a4b4680" xlink:to="loc_ifrs-full_OtherAdjustmentsForNoncashItems_5c792cb9-426d-4813-a124-de183b58ffdd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_74935903-2e3e-4c8b-9ff4-6f0e85cdb6c9" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_NetCashPaidacquiredOnAcquisitionOfSubsidiariesClassifiedAsInvestingActivities_6db18579-17cb-4bc6-9498-113e2b110785" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_NetCashPaidacquiredOnAcquisitionOfSubsidiariesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_74935903-2e3e-4c8b-9ff4-6f0e85cdb6c9" xlink:to="loc_mgplc_NetCashPaidacquiredOnAcquisitionOfSubsidiariesClassifiedAsInvestingActivities_6db18579-17cb-4bc6-9498-113e2b110785" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mgplc_InvestmentInSubsidiariesByConsolidatedPrivateEquityVehicles_a060f261-12d7-45b8-8420-307a3388a0ff" xlink:href="254900TWUJUQ44TQJY84-2023-12-31.xsd#mgplc_InvestmentInSubsidiariesByConsolidatedPrivateEquityVehicles"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_74935903-2e3e-4c8b-9ff4-6f0e85cdb6c9" xlink:to="loc_mgplc_InvestmentInSubsidiariesByConsolidatedPrivateEquityVehicles_a060f261-12d7-45b8-8420-307a3388a0ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_e7f60a67-191d-45a0-ab8a-17f497ba53ec" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_74935903-2e3e-4c8b-9ff4-6f0e85cdb6c9" xlink:to="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_e7f60a67-191d-45a0-ab8a-17f497ba53ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_30cc117f-ac3c-4cf1-9155-c7694413e3d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_74935903-2e3e-4c8b-9ff4-6f0e85cdb6c9" xlink:to="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_30cc117f-ac3c-4cf1-9155-c7694413e3d1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_53f944ed-689f-4563-afd7-9121f0f99a2b" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_74935903-2e3e-4c8b-9ff4-6f0e85cdb6c9" xlink:to="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_53f944ed-689f-4563-afd7-9121f0f99a2b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_883eaedf-86b4-459a-993d-cc36c4d4b313" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_28868d54-c018-48e8-ba76-37fb2b93ebfc" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_883eaedf-86b4-459a-993d-cc36c4d4b313" xlink:to="loc_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_28868d54-c018-48e8-ba76-37fb2b93ebfc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_21a7a91a-75db-49d3-aa37-81b2802dfbaf" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_883eaedf-86b4-459a-993d-cc36c4d4b313" xlink:to="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_21a7a91a-75db-49d3-aa37-81b2802dfbaf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromIssuingOtherEquityInstruments_57c1c02c-92ae-424a-b96c-3fe6e2580a12" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromIssuingOtherEquityInstruments"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_883eaedf-86b4-459a-993d-cc36c4d4b313" xlink:to="loc_ifrs-full_ProceedsFromIssuingOtherEquityInstruments_57c1c02c-92ae-424a-b96c-3fe6e2580a12" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsFinancingActivities_cb67640d-a87d-400e-a95f-7cd4ce87d4ed" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_883eaedf-86b4-459a-993d-cc36c4d4b313" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsFinancingActivities_cb67640d-a87d-400e-a95f-7cd4ce87d4ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities_9436c129-0916-4483-bc56-a5118629d767" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_883eaedf-86b4-459a-993d-cc36c4d4b313" xlink:to="loc_ifrs-full_DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities_9436c129-0916-4483-bc56-a5118629d767" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_40bf6463-645d-43bf-b39c-959849a84639" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_883eaedf-86b4-459a-993d-cc36c4d4b313" xlink:to="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_40bf6463-645d-43bf-b39c-959849a84639" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
