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Deferred income tax - Additional information (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred income tax      
Deferred tax liability (asset) £ 477 £ 474 £ 470
Tax losses      
Deferred income tax      
Deferred tax liability (asset) £ (41) (38) £ (23)
Utilisation period for deferred tax assets 10 years    
Unremitted earnings from subsidiaries      
Deferred income tax      
Deferred tax liability (asset) £ 3 4  
UK      
Deferred income tax      
Capital losses carried forward on which no deferred tax asset is recognised 276 276  
UK | Tax losses      
Deferred income tax      
Deferred tax liability (asset) (30) (28)  
Tax losses for which deferred tax assets not recognized   34  
Certain jurisdictions | Tax losses      
Deferred income tax      
Tax losses for which deferred tax assets not recognized 242 169  
Certain jurisdictions | Tax losses | Not later than 21 years      
Deferred income tax      
Tax losses for which deferred tax assets not recognized £ 203    
Certain jurisdictions | Tax losses | Not later than 22 years      
Deferred income tax      
Tax losses for which deferred tax assets not recognized   £ 95