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Income tax expense - Reconciliation (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income tax expense      
Profit before tax £ 405 £ 493 £ 296
Tax calculated at domestic tax rates applicable to profits in the respective countries 101 123 69
Adjustment in respect of previous periods (2) (12) (9)
Amounts not (taxable)/deductible for tax purposes - one-off and adjusting items (1) 1 9
Expenses not deductible for tax purposes - other 6 6 3
Income not subject to tax (2) (2) (5)
Impairment of goodwill 6   5
Deferred tax recognised on losses (9) (3) (1)
Deferred tax impact of change in tax rates (3)   (7)
Provisions utilised for which no deferred tax assets were recognised 2   (1)
Local business taxes 1 1 1
US BEAT liability   1  
Tax credits (1) (2)  
Other   (1)  
Total income tax expense £ 98 £ 112 £ 64