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Earnings/(losses) from associates - Additional Information (Details) - GBP (£)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of associates [line items]      
Earnings/(losses) from associates £ 36,000,000 £ 70,000,000 £ (60,000,000)
Investments accounted for using equity method 253,000,000 287,000,000 305,000,000
Restructuring and transformation costs 251,000,000 196,000,000 219,000,000
Kantar      
Disclosure of associates [line items]      
Non-refundable distribution received   £ 45,000,000 0
Investments accounted for using equity method 0    
Kantar      
Disclosure of associates [line items]      
Non-refundable distribution received £ 2,000,000    
Amortisation and impairment of acquired intangible assets other than goodwill     76,000,000
Restructuring and transformation costs     £ 55,000,000