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Deferred tax - Movements of Gross Deferred Tax Liabilities (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance £ 179  
Ending balance 142 £ 179
Gross deferred tax liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 445 618
Acquisition of subsidiaries 8 35
(Credit)/charge to income (26) (172)
Disposal of subsidiaries (34)  
Exchange differences and other movements (6) (36)
Ending balance 387 445
Gross deferred tax liabilities | Brands and other intangibles    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 195 353
Acquisition of subsidiaries 8 35
(Credit)/charge to income (28) (172)
Disposal of subsidiaries (15)  
Exchange differences and other movements 0 (21)
Ending balance 160 195
Gross deferred tax liabilities | Associate earnings    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 19 36
Acquisition of subsidiaries 0 0
(Credit)/charge to income (6) (16)
Disposal of subsidiaries 0  
Exchange differences and other movements 1 (1)
Ending balance 14 19
Gross deferred tax liabilities | Goodwill    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 181 174
Acquisition of subsidiaries 0 0
(Credit)/charge to income 8 18
Disposal of subsidiaries (18)  
Exchange differences and other movements 3 (11)
Ending balance 174 181
Gross deferred tax liabilities | Plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 22 24
Acquisition of subsidiaries 0 0
(Credit)/charge to income 7 0
Disposal of subsidiaries (1)  
Exchange differences and other movements (12) (2)
Ending balance 16 22
Gross deferred tax liabilities | Other temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 28 31
Acquisition of subsidiaries 0 0
(Credit)/charge to income (7) (2)
Disposal of subsidiaries 0  
Exchange differences and other movements 2 (1)
Ending balance £ 23 £ 28