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Equity - Schedule of employee share compensation (Details) - GBP (£) £ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of fair value measurement of equity [line items] |  |  |
Annual fair value charge of equity settled plans | £ 48 | £ 59 | £ 50
Equity-settled plans |  |  |
Disclosure of fair value measurement of equity [line items] |  |  |
Annual fair value charge of equity settled plans | 49 | 59 | 49
Executive share award plans |  |  |
Disclosure of fair value measurement of equity [line items] |  |  |
Annual fair value charge of equity settled plans | 41 | 51 | 41
Executive share option plans |  |  |
Disclosure of fair value measurement of equity [line items] |  |  |
Annual fair value charge of equity settled plans | 4 | 4 | 4
Savings plans |  |  |
Disclosure of fair value measurement of equity [line items] |  |  |
Annual fair value charge of equity settled plans | £ 4 | £ 4 | £ 4

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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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