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Deferred income tax - Additional information (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred income tax      
Deferred tax liability (asset) £ 474 £ 470 £ 66
Utilisation period for deferred tax assets 10 years    
Not later than 17 years      
Deferred income tax      
Tax losses for which deferred tax assets not recognized £ 95 74  
Tax losses      
Deferred income tax      
Deferred tax liability (asset) £ (38) (23) £ (14)
Utilisation period for deferred tax assets 10 years    
Unremitted earnings from subsidiaries      
Deferred income tax      
Deferred tax liability (asset) £ 4 5  
UK      
Deferred income tax      
Tax losses for which deferred tax assets not recognized 34 120  
Capital losses carried forward on which no deferred tax asset is recognised 276 276  
UK | Tax losses      
Deferred income tax      
Deferred tax liability (asset) (28) (18)  
Certain jurisdictions      
Deferred income tax      
Tax losses for which deferred tax assets not recognized £ 169 £ 230