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Deferred income tax - Additional information (Details) - GBP (£)
£ in Millions
 12 Months Ended
Apr. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax        
Tax effect from change in tax rate   £ 7 £ 4 £ 9
Deferred tax liability (asset)   £ 468 66 57
Utilisation period for deferred tax assets   10 years    
2023-2039        
Deferred income tax        
Tax losses for which deferred tax assets not recognized   £ 74 8  
Tax losses        
Deferred income tax        
Deferred tax liability (asset)   (23) (14) £ (18)
Unremitted earnings from subsidiaries        
Deferred income tax        
Deferred tax liability (asset)   £ 5 £ 5  
UK        
Deferred income tax        
UK corporation tax rate 25.00% 19.00% 19.00% 19.00%
Tax effect from change in tax rate   £ 5    
Tax losses for which deferred tax assets not recognized   120 £ 41  
Capital losses carried forward on which no deferred tax asset is recognised   276 276  
UK | Tax losses        
Deferred income tax        
Deferred tax liability (asset)   (18) (12)  
Certain jurisdictions        
Deferred income tax        
Tax losses for which deferred tax assets not recognized   £ 230 £ 82