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Deferred tax - Movements of Major Gross Deferred Tax Assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance £ 324  
Ending balance 323 £ 324
Gross deferred tax assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 590 589
(Charge)/credit to income (4) 26
Credit to other comprehensive income 2 2
Credit to equity 1  
Disposal of subsidiaries (5)  
Exchange differences and other movements (16) (27)
Ending balance 568 590
Gross deferred tax assets | Deferred compensation    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 65 74
(Charge)/credit to income (10) (6)
Credit to other comprehensive income 0 0
Credit to equity 0  
Disposal of subsidiaries (2)  
Exchange differences and other movements (2) (3)
Ending balance 51 65
Gross deferred tax assets | Accounting provisions and accruals    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 132 120
(Charge)/credit to income (15) 14
Credit to other comprehensive income 0 0
Credit to equity 0  
Disposal of subsidiaries (1)  
Exchange differences and other movements (2) (2)
Ending balance 114 132
Gross deferred tax assets | Retirement benefit obligations    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 50 48
(Charge)/credit to income 2 3
Credit to other comprehensive income 2 2
Credit to equity 0  
Disposal of subsidiaries 0  
Exchange differences and other movements (2) (3)
Ending balance 52 50
Gross deferred tax assets | Plant and equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 36 48
(Charge)/credit to income (3) (12)
Credit to other comprehensive income 0 0
Credit to equity 0  
Disposal of subsidiaries 0  
Exchange differences and other movements (1) 0
Ending balance 32 36
Gross deferred tax assets | Property    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 56 54
(Charge)/credit to income (12) (5)
Credit to other comprehensive income 0 0
Credit to equity 0  
Disposal of subsidiaries 0  
Exchange differences and other movements 4 7
Ending balance 48 56
Gross deferred tax assets | Tax losses and credits    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 104 123
(Charge)/credit to income 35 (12)
Credit to other comprehensive income 0 0
Credit to equity 0  
Disposal of subsidiaries 0  
Exchange differences and other movements 0 (7)
Ending balance 139 104
Gross deferred tax assets | Share- based payments    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 35 32
(Charge)/credit to income (2) 4
Credit to other comprehensive income 0 0
Credit to equity 1  
Disposal of subsidiaries (2)  
Exchange differences and other movements 0 (1)
Ending balance 32 35
Gross deferred tax assets | Restructuring provisions    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 107 85
(Charge)/credit to income (5) 38
Credit to other comprehensive income 0 0
Credit to equity 0  
Disposal of subsidiaries 0  
Exchange differences and other movements (13) (16)
Ending balance 89 107
Gross deferred tax assets | Other temporary differences    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 5 5
(Charge)/credit to income 6 2
Credit to other comprehensive income 0 0
Credit to equity 0  
Disposal of subsidiaries 0  
Exchange differences and other movements 0 (2)
Ending balance £ 11 £ 5