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Financial risk management objectives and policies - Analysis of Financial Assets and Liabilities (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Other investments £ 398 £ 333 £ 370
Deferred income and customer advances 1,160 1,319  
Borrowings (4,328) (4,721)  
Derivative liabilities (52) 31  
Contingent consideration liabilities (133) (199)  
Liabilities in respect of put options (67) (104)  
Derivatives in designated hedge relationships | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 4 31  
Derivative liabilities (55) 0  
Financial instruments (51) 31  
Held at fair value through profit or loss | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 1 2  
Other investments 306 258  
Cash and cash equivalents 655 181  
Derivative liabilities (2) (2)  
Contingent consideration liabilities (133) (199)  
Financial instruments 827 240  
Held at fair value through other comprehensive income | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Other investments 92 75  
Financial instruments 92 75  
Amortised cost | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Trade and other receivables 10,197 10,719  
Cash and cash equivalents 1,983 2,037  
Trade and other payables (10,912) (10,919)  
Deferred income and customer advances (1,160) (1,319)  
Borrowings (4,328) (4,721)  
Liabilities in respect of put options (67) (104)  
Financial instruments (4,287) (4,307)  
Carrying value | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Trade and other receivables 10,197 10,719  
Derivative assets 5 33  
Other investments 398 333  
Cash and cash equivalents 2,638 2,218  
Trade and other payables (10,912) (10,919)  
Deferred income and customer advances (1,160) (1,319)  
Borrowings (4,328) (4,721)  
Derivative liabilities (57) (2)  
Contingent consideration liabilities (133) (199)  
Liabilities in respect of put options (67) (104)  
Financial instruments £ (3,419) £ (3,961)