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Acquisition of businesses - Schedule of cash consideration paid in respect of acquisition of businesses and purchase of shares of non-controlling interests (Details) £ in Millions	6 Months Ended
	Dec. 31, 2022 GBP (£)
Disclosure of detailed information about business combination [line items]
Cash consideration paid	£ (96)
Net cash outflow on acquisition of businesses	(144)
Other consideration
Disclosure of detailed information about business combination [line items]
Cash consideration paid	(96)
Other consideration | Prior year acquisitions
Disclosure of detailed information about business combination [line items]
Cash consideration paid	(10)
Aggregated individually immaterial business combinations [member]
Disclosure of detailed information about business combination [line items]
Cash	1
Aggregated individually immaterial business combinations [member] | Prior year acquisitions
Disclosure of detailed information about business combination [line items]
Cash consideration paid	(8)
Cash consideration paid
Disclosure of detailed information about business combination [line items]
Cash consideration paid	(3)
Capital injection	£ (28)

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- Definition

Net Cash Outflow On Acquisition Of Businesses And Investments Accounted For Using Equity Method

+ 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; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B64
-Subparagraph i
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B64
-Subparagraph f
-Clause i
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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