Investments - Summary of group's share of joint venture (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments
Revenue	£ 116	£ 121
Net profit for the year	44	43	£ 46
Total assets	182	198
Total liabilities	(86)	(97)
Net assets	96	101
Goodwill	68	68
Total	164	169	£ 178
Other comprehensive income	£ 0	£ 0

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

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The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Other comprehensive income]

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Share of liabilities of associates and joint ventures accounted for using equity method

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Share of net assets of associates and joint ventures accounted for using equity method

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Share of revenue of associates and joint ventures accounted for using equity method

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