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Business combinations - Revenue and Operating Profit (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Business combinations
Revenue from the dates of acquisition	£ 68	£ 75
Operating profit from the dates of acquisition	1	10
Revenue as if acquisition happened at the beginning	5,492	5,414
Operating profit as if acquisition happened at the beginning	£ 551	£ 628

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- References

No definition available.

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- Definition

The profit (loss) of the acquiree, since the acquisition date, included in the consolidated statement of comprehensive income. [Refer: Profit (loss)]

+ References

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- Definition

The profit (loss) of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Total for all business combinations [member]; Profit (loss)]

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The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue]

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- Definition

The revenue of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Total for all business combinations [member]; Revenue]

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