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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
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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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

Equity Impact On Weakening Strengthening Of Sterling Against Major Currencies

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- Definition

Losses/Gains resulting from a weakening/strengthening of sterling against major currencies, which would be posted directly to equity.

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