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Finance and investment income, finance costs and revaluation and retranslation of financial instruments - Summary of Finance Income, Finance Costs and Revaluation and Retranslation of Financial Instruments (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]      
Financial assets measured at fair value through profit and loss £ 123 £ 111 £ 118
Financial assets measured at fair value through profit and loss 11 13 24
Other interest income 3 3 3
Finance and investment income 137 127 145
Interest on bank overdrafts, bonds and bank loans 309 273 258
Interest expense related to lease liabilities 98 106 96
Interest on other long-term employee benefits 6 6 3
Net interest expense on pension plans 4 4 2
Finance costs 417 389 359
Movements in fair value of derivative financial instruments (17) (3) 1
Premium on the early repayment of bonds (16) 0 0
Revaluation of investments and other assets held at fair value through profit or loss (24) (21) 23
Remeasurement of put options over non-controlling interests (10) (1) 28
Revaluation of contingent consideration liabilities 1 51 26
Retranslation of financial instruments 16 (19) (2)
Net revaluation and retranslation of financial instrument (loss)/gain £ (50) £ 7 £ 76