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Business combinations (Details) £ in Millions	12 Months Ended
	Dec. 31, 2023 GBP (£) company	Dec. 31, 2022 GBP (£) company	Dec. 31, 2021 GBP (£)
Business combinations
Percentage of impact on revenue and Adjusted Operating Profit for business combination to be considered material	5.00%
Percentage of impact on goodwill for business combination to be considered material	10.00%
Percentage of share capital acquired	100.00%
Number of companies and businesses acquired | company	41	53
Total purchase consideration	£ 261	£ 4,369
Cash outflow on current and past acquisitions	£ 242	£ 1,018	£ 463

X

- Definition

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

+ References

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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X

- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

+ References

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-Number 3
-IssueDate 2023-01-01
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- Definition

Represents the number of companies and businesses acquired.

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- Definition

Percentage of impact on goodwill for business combination to be considered material

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- Definition

Percentage of impact on revenue and APBITA for business combination to be considered material

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