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Disposals of subsidiaries - Additional information (Details) - GBP (£) £ in Millions			12 Months Ended
		Dec. 02, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Aug. 07, 2024
Disclosure of Detailed information Amounts About In Discontinued Operations Included In Profit [Line Items]
Disposals of investments and subsidiaries	[1]		£ 553	£ 99	£ 38
Discontinued operations
Disclosure of Detailed information Amounts About In Discontinued Operations Included In Profit [Line Items]
Consideration received		£ 613
Percentage of investment disposed						50.40%
Loan settled		£ 93
Discontinued operations | Other Disposal
Disclosure of Detailed information Amounts About In Discontinued Operations Included In Profit [Line Items]
Disposals of investments and subsidiaries			£ 33	£ 99
[1] Disposals of investments and subsidiaries represents consideration received less cash and cash equivalents disposed.

X

- Definition

The cash outflow for repayments of advances and loans from related parties. [Refer: Total for all related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Total for all subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

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- Definition

The cash flows from disposals of investments and subsidiaries classified as investing activities.

+ References

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- Definition

Percentage Of Investment Disposed

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