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Fair value estimation - Contingent consideration (Details) - Contingent consideration - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair value estimation
Balance at the beginning	£ 76	£ 70
Exchange differences	(1)	(3)
Acquisitions	31	41
Payments	(25)	(28)
Unused amount reversed	(7)
Revaluation of put option through equity	1	(4)
Balance at the end	£ 75	£ 76

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The gains (losses) on exchange differences, recognised in profit or loss, on the fair value measurement of liabilities. [Refer: At fair value [member]]

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The increase in fair value measurement of liabilities resulting from issues of those liabilities. [Refer: At fair value [member]]

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The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]]

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