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Additional information - Financial Statement Schedule I - Condensed statement of changes in equity (Details)
 12 Months Ended
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
GBP (£)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Balance at beginning of the year £ 103,950,000   £ 127,508,000   £ 272,512,000  
(Loss)/profit for the year (113,159,000)   (28,678,000)   (115,510,000)  
Total comprehensive loss for the year (118,161,000)   (25,626,000)   (111,649,000)  
Proceeds from issue of shares 158,541,000          
Equity-settled share based payments 875,000   1,753,000   198,000  
Dividends paid 0 $ 0 0 $ 0 (33,553,000) $ (44,010,000)
Balance at end of the year 144,890,000   103,950,000   127,508,000  
Share capital            
Balance at beginning of the year 53,000   53,000   53,000  
Proceeds from issue of shares 2,000          
Balance at end of the year 55,000   53,000   53,000  
Share premium            
Balance at beginning of the year 68,822,000   68,822,000   68,822,000  
Proceeds from issue of shares 158,539,000          
Balance at end of the year 227,361,000   68,822,000   68,822,000  
Treasury shares            
Balance at beginning of the year (21,305,000)   (21,305,000)   (21,305,000)  
Balance at end of the year (21,305,000)   (21,305,000)   (21,305,000)  
Retained earnings            
Balance at beginning of the year (196,652,000)   (170,042,000)   (13,652,000)  
(Loss)/profit for the year (113,159,000)   (28,678,000)   (115,510,000)  
Total comprehensive loss for the year (113,159,000)   (28,678,000)   (115,510,000)  
Equity-settled share based payments 875,000   1,753,000   198,000  
Dividends paid         (33,553,000)  
Balance at end of the year (309,251,000)   (196,652,000)   (170,042,000)  
Parent            
Balance at beginning of the year 293,757,000   305,679,000   309,683,000  
(Loss)/profit for the year (51,681,000)   (13,675,000)   29,351,000  
Total comprehensive loss for the year (51,681,000)   (13,675,000)   29,351,000  
Proceeds from issue of shares 158,541,000          
Equity-settled share based payments 876,000   1,753,000   198,000  
Dividends paid         (33,553,000)  
Balance at end of the year 401,493,000   293,757,000   305,679,000  
Parent | Share capital            
Balance at beginning of the year 53,000   53,000   53,000  
Proceeds from issue of shares 2,000          
Balance at end of the year 55,000   53,000   53,000  
Parent | Share premium            
Balance at beginning of the year 68,822,000   68,822,000   68,822,000  
Proceeds from issue of shares 158,539,000          
Balance at end of the year 227,361,000   68,822,000   68,822,000  
Parent | Treasury shares            
Balance at beginning of the year (21,305,000)   (21,305,000)   (21,305,000)  
Balance at end of the year (21,305,000)   (21,305,000)   (21,305,000)  
Parent | Retained earnings            
Balance at beginning of the year 246,187,000   258,109,000   262,113,000  
(Loss)/profit for the year (51,681,000)   (13,675,000)   29,351,000  
Total comprehensive loss for the year (51,681,000)   (13,675,000)   29,351,000  
Equity-settled share based payments 876,000   1,753,000   198,000  
Dividends paid         (33,553,000)  
Balance at end of the year £ 195,382,000   £ 246,187,000   £ 258,109,000