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Business combinations - Cash Outflow From Current and Past acquisitions (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business combinations
Total purchase consideration	£ 182	£ 261
Consideration payable in future periods	(67)	(58)
Purchase consideration paid in cash	115	203
Cash and cash equivalents in acquired companies and businesses	(2)	(8)
Cash outflow on current period acquisitions	113	195
Deferred and contingent consideration paid	59	47
Cash outflow on current and past acquisitions	£ 172	£ 242	£ 1,018

X

- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Total for all business combinations [member]]

+ References

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- Definition

The amount recognised as of the acquisition date for cash and cash equivalents acquired in a business combination. [Refer: Cash and cash equivalents; Total for all business combinations [member]]

+ References

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- Definition

The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Total for all subsidiaries [member]]

+ References

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- Definition

The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Total for all business combinations [member]]

+ References

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- Definition

The fair value, at acquisition date, of liabilities incurred (for example, a liability for contingent consideration) as consideration transferred in a business combination. [Refer: Total for all business combinations [member]]

+ References

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Cash flows used in obtaining control of subsidiaries or other businesses on current period acquisition.

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