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Tax - Deferred tax reconciliation (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of net deferred tax asset    
At 1 January £ 1,753 £ 1,951
Credit/(charge) to income statement 95 62
Credit/(charge) to other comprehensive income (66) (258)
Currency translation and other adjustments (5) (2)
At 31 December 1,777 1,753
Pension    
Reconciliation of net deferred tax asset    
At 1 January (16) (23)
Credit/(charge) to income statement 3 (1)
Credit/(charge) to other comprehensive income (15) 8
Currency translation and other adjustments (1)  
At 31 December (29) (16)
Accelerated capital allowances    
Reconciliation of net deferred tax asset    
At 1 January 76 75
Credit/(charge) to income statement 85 1
At 31 December 161 76
Provisions    
Reconciliation of net deferred tax asset    
At 1 January 61 82
Credit/(charge) to income statement 16 (21)
At 31 December 77 61
Fair value of financial instruments    
Reconciliation of net deferred tax asset    
At 1 January 538 805
Credit/(charge) to income statement (57) (16)
Credit/(charge) to other comprehensive income (77) (249)
Currency translation and other adjustments (1) (2)
At 31 December 403 538
Total losses carried forward    
Reconciliation of net deferred tax asset    
At 1 January 1,019 952
Credit/(charge) to income statement 90 67
Currency translation and other adjustments (3)  
At 31 December 1,106 1,019
Other    
Reconciliation of net deferred tax asset    
At 1 January 75 60
Credit/(charge) to income statement (42) 32
Credit/(charge) to other comprehensive income 26 (17)
At 31 December £ 59 £ 75