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Accounting information and policies - Principal foreign exchange rates used in translation of financial statements (Details) | 12 Months Ended
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Jun. 30, 2023 € / £ $ / £ | Jun. 30, 2022 $ / £ € / £ | Jun. 30, 2021 € / £ $ / £
US dollar |  |  |
Foreign exchange rates [abstract] |  |  |
Income statement and cash flows | $ / £ | 1.20 | 1.33 | 1.35
Assets and liabilities | $ / £ | 1.26 | 1.21 | 1.39
Euro |  |  |
Foreign exchange rates [abstract] |  |  |
Income statement and cash flows | € / £ | 1.15 | 1.18 | 1.13
Assets and liabilities | € / £ | 1.17 | 1.16 | 1.17

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + 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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Period Type: | duration

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + 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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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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- Details
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Balance Type: |
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- Details
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