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Deferred tax - Analysis of Deferred Tax Balances for Financial Reporting Purposes (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]    
Deferred tax assets gross £ 661 £ 684
Deferred tax liabilities gross (480) (539)
Net deferred tax assets 181 145
Gross of balances arising from a single transaction (93) (94)
Gross of balances arising from a single transaction 93 94
Gross of balances arising from a single transaction 0 0
Gross balances before offset within countries 568 590
Gross balances before offset within countries (387) (445)
Gross balances before offset within countries 181 145
Deferred tax assets, offset (245) (266)
Deferred tax liabilities, offset 245 266
Offset, net 0 0
Deferred tax assets 323 324
Deferred tax liabilities £ (142) £ (179)