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Share-based payments - Charges for Share-based Incentive Plans (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of share based payments [abstract]      
Share-based payments £ 140.1 £ 122.0 £ 99.6