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Leases - Amounts recognised in the consolidated income statement - Narrative (Details) - GBP (£) £ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Disclosure Of Quantitative Information About Leases [Line Items] |  |
Expenses in respect of leases of low value assets and short term leases | £ 57 | £ 39
Expenses in respect of variable lease payments | 4 | 9
Total cash outflow for leases | £ 172 | £ 154

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- Definition [Line Items] for Disclosure Of Quantitative Information About Leases [Table] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Expense Relating To Short Term Leases And To Leases Of Low Value Assets For Which Recognition Exemption Has Been Used + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2022-03-24 -Paragraph 53 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_53_g&doctype=Standard -URIDate 2022-03-24 + Details
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Balance Type: | credit
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- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2022-03-24 -Paragraph 53 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2022-en-r&anchor=para_53_e&doctype=Standard -URIDate 2022-03-24 + Details
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