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Summary of significant accounting policies - Exchange rates (Details)	12 Months Ended
	Jun. 30, 2019 $ / £	Jun. 30, 2019 $ / £ € / £	Jun. 30, 2018 $ / £	Jun. 30, 2018 $ / £ € / £	Jun. 30, 2017 $ / £	Jun. 30, 2017 $ / £ € / £	Jun. 30, 2019 € / £	Jun. 30, 2018 € / £	Jun. 30, 2017 € / £
Exchange rates
Closing rate	1.2718	1.2718	1.3194	1.3194	1.2988	1.2988	1.1170	1.1309	1.1379
Average rate	1.2959	1.1346	1.3465	1.1327	1.2774	1.1663

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
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+ Details

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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
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X

- References

No definition available.

+ Details

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