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Summary of significant accounting policies - Exchange rates (Details)	12 Months Ended
	Jun. 30, 2025 € / £	Jun. 30, 2025 € / £ $ / £	Jun. 30, 2024 € / £	Jun. 30, 2024 $ / £ € / £	Jun. 30, 2023 € / £	Jun. 30, 2023 € / £ $ / £	Jun. 30, 2025 $ / £	Jun. 30, 2024 $ / £	Jun. 30, 2023 $ / £
Exchange rates
Closing rate	1.1667	1.1667	1.1799	1.1799	1.1652	1.1652	1.3709	1.2643	1.2716
Average rate	1.1908	1.2972	1.1652	1.2605	1.1524	1.2081

X

- 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 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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Balance Type:	na
Period Type:	duration

X

- 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 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration