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Employee benefit expense (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Employee benefit expense      
Wages and salaries £ 2,318 £ 1,582 £ 1,225
Social security costs 171 154 138
Share-based payments 27 17 10
Pension costs:      
- defined contribution plans 32 22 31
- defined benefits plans 2 2 1
Total employee costs 2,550 1,777 £ 1,405
One-off and adjusting wages and salaries £ 44 £ 41