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Summary of significant accounting policies - Exchange rates (Details) | 12 Months Ended |  |  |
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Jun. 30, 2021 € / £ | Jun. 30, 2021 € / £ $ / £ | Jun. 30, 2020 € / £ | Jun. 30, 2020 $ / £ € / £ | Jun. 30, 2019 € / £ | Jun. 30, 2019 $ / £ € / £ | Jun. 30, 2021 $ / £ | Jun. 30, 2020 $ / £ | Jun. 30, 2019 $ / £
Exchange rates |  |  |  |  |  |  |  |  |
Closing rate | 1.1651 | 1.1651 | 1.0998 | 1.0998 | 1.1170 | 1.1170 | 1.3820 | 1.2374 | 1.2718
Average rate | 1.1382 | 1.3461 | 1.1391 | 1.2633 | 1.1346 | 1.2959 |  |  |

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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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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