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Taxation - Tax Charge Reconciled to Profit Before Taxation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Major components of tax expense (income) [abstract]      
Profit before taxation £ 1,031 £ 346 £ 1,160
Tax at the corporation tax rate of 25.0% 258 81 220
Tax effect of (earnings)/losses from associates (9) (15) 17
Irrecoverable withholding taxes 29 35 26
Tax effect of items that are not deductible in determining taxable profits 101 39 68
Tax effect of non-deductible goodwill impairment 65 16 7
Effect of different tax rates in subsidiaries operating in other jurisdictions 18 42 94
Origination and reversal of unrecognised temporary differences (10) 9 (1)
Tax losses not recognised or utilised in the year 21 44 10
Utilisation of tax losses not previously recognised (6) (15) (5)
Net release of prior year provisions in relation to acquired businesses 0 (4) (3)
Other prior year adjustments (70) (83) (48)
Impact of OECD Pillar Two income taxes 5 0 0
Tax charge £ 402 £ 149 £ 385
Effective tax rate on profit before tax 39.00% 43.10% 33.10%