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Share-based payments (Details)
12 Months Ended
Jun. 30, 2019
$ / shares
shares
Jun. 30, 2019
GBP (£)
EquityInstruments
£ / shares
shares
Jun. 30, 2018
GBP (£)
EquityInstruments
Jun. 30, 2017
GBP (£)
Disclosure of terms and conditions of share-based payment arrangement        
Expenses related to equity-settled share-based payment transactions | £   £ 699,000 £ 2,915,000 £ 2,187,000
Expenses related to cash-settled share-based payment transactions | £   £ 552,000 £ 3,301,000 £ 1,903,000
Class A ordinary shares        
Disclosure of terms and conditions of share-based payment arrangement        
Shares reserved for issuance | shares 16,000,000 16,000,000    
Shares that remain available for issuance | shares 15,059,727 15,059,727    
Outstanding in share-based payment arrangement at beginning of period   83,153    
Awarded   55,976    
Vested   (44,577)    
Outstanding in share-based payment arrangement at end of period   94,552 83,153  
Fair value of shares awarded (per share) | (per share) $ 18.30 £ 14.34