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Financial risk management objectives and policies - Summary of Currency Risk (Details) - Currency risk - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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US dollar |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Impact on income statement Gain/(loss) | £ (82) | £ 41
Impact on equity Gain/(loss) | 93 | 18
Euro |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Impact on income statement Gain/(loss) | 105 | 186
Impact on equity Gain/(loss) | £ 0 | £ 0

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