Investments in Joint Ventures and Associates - Additional Information (Detail) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments in associates and joint ventures [line items]
Proportion of ownership interest in associate	49.00%
Investments in associates reported in separate financial statements	£ 8	£ 12
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method	1	2	£ 1
The Egyptian International Publishing Company-Longman
Investments in associates and joint ventures [line items]
Investments in associates reported in separate financial statements	£ 6	9
Academy of Pop [Member]
Investments in associates and joint ventures [line items]
Proceeds from sales of interests in associates		4
Cumulative gain on disposal financial statements		£ 2

The gain on the disposal of investments.

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The amount of investments in associates in an entity's separate financial statements. [Refer: Total for all associates [member]]

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