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Our people - Summary of Compensation for Key Management Personnel (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Number and average number of employees [abstract]      
Short-term employee benefits £ 27 £ 28 £ 30
Pensions and other post-retirement benefits 1 1 1
Share-based payments 19 30 30
Key management personnel compensation £ 47 £ 59 £ 61