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Income tax expense - Additional Information (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income tax expense      
Effective tax rate 21.60% 19.00%  
Effective tax rate before amortisation of intangible assets (excluding computer software), one-off and adjusting items and the net interest adjustments 19.70% 19.40%  
Blended tax rate 24.00% 24.00%  
Net prior year tax credit £ 9 £ 16 £ 9
Credited to other comprehensive income £ 11 £ 2