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Retirement benefit obligations - Movement in net defined benefit obligation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset)    
Beginning balance £ (25) £ (27)
Changes in net defined benefit liability (asset)    
Current service costs (1) (1)
Interest on defined benefit obligation/asset (1) (1)
Exchange difference   1
Total pension income/(expense) (2) (1)
Contributions:    
Employers   1
Benefit payments 5 2
Ending balance (22) (25)
Retirement benefit obligation schemes (25) (28)
Retirement benefit asset schemes 3 3
Estimate of contributions expected to be paid to defined benefit pension schemes next year 1  
Present value of obligation    
Disclosure of net defined benefit liability (asset)    
Beginning balance (60) (65)
Changes in net defined benefit liability (asset)    
Current service costs (1) (1)
Interest on defined benefit obligation/asset (2) (2)
Exchange difference 2 2
Total pension income/(expense) (1) (1)
Contributions:    
Employers (1) (1)
Benefit payments 6 7
Ending balance (56) (60)
Retirement benefit obligation schemes (41) (44)
Retirement benefit asset schemes (15) (16)
Present value of obligation | Unfunded obligations    
Disclosure of net defined benefit liability (asset)    
Beginning balance (20)  
Contributions:    
Ending balance (17) (20)
Fair value of plan assets    
Disclosure of net defined benefit liability (asset)    
Beginning balance 35 38
Changes in net defined benefit liability (asset)    
Interest on defined benefit obligation/asset 1 1
Exchange difference (2) (1)
Total pension income/(expense) (1)  
Contributions:    
Employers 1 2
Benefit payments (1) (5)
Ending balance 34 35
Retirement benefit obligation schemes 16 16
Retirement benefit asset schemes £ 18 £ 19