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Employee benefit obligations - Pension Costs (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Pension Costs [abstract]      
Defined contribution plans £ 202 £ 198 £ 191
Defined benefit plans charge to operating profit 13 15 14
Pension costs 215 213 205
Net interest expense on pension plans 4 4 2
Pension costs, Net £ 219 £ 217 £ 207