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Income tax expense (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income tax expense      
Current tax expense £ 89 £ 94 £ 76
Adjustment in respect of previous periods 5 (8) 2
Total current tax 94 86 78
Deferred tax expense/(credit) 11 30 (3)
Deferred tax adjustment in respect of previous periods (7) (4) (11)
Total deferred tax 4 26 (14)
Total income tax expense £ 98 £ 112 £ 64