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Share capital (Details)
 12 Months Ended
Jun. 30, 2021
GBP (£)
item
Vote
shares
Jun. 30, 2020
GBP (£)
shares
Jun. 30, 2021
$ / shares
Jun. 30, 2021
GBP (£)
shares
Ordinary shares        
Balance at the beginning | £ £ 53,000      
Balance at the end | £ £ 53,000 £ 53,000    
Number of class of ordinary shares | item 2      
Number of class A shares to which one B share is convertible 1      
Proportion of votes required for special resolutions 66.67%      
Treasury shares | £   £ 21,305,000   £ 21,305,000
Ordinary shares        
Number of shares        
Balance at the beginning (in shares) 164,622,000 164,571,000    
Employee share-based compensation awards - issue of shares (in shares) 55,000 51,000    
Balance at the end (in shares) 164,677,000 164,622,000    
Ordinary shares        
Balance at the beginning | £ £ 53,000 £ 53,000    
Employee share-based compensation awards - issue of shares | £ 0 0    
Balance at the end | £ £ 53,000 £ 53,000    
Class A ordinary shares        
Ordinary shares        
Par value per ordinary share (in dollars per share) | $ / shares     $ 0.0005  
Number of voting right per share | Vote 1      
Number of shares issued   40,622,089   44,969,701
Number of shares issued on conversion 4,292,387      
Number of shares held in treasury       1,682,896
Treasury shares | £       £ 21,305,000
Class B ordinary shares        
Ordinary shares        
Par value per ordinary share (in dollars per share) | $ / shares     $ 0.0005  
Number of voting right per share | Vote 10      
Percentage of ordinary shares outstanding below which Class B shares will convert to Class A 10.00%      
Percentage of voting power of shareholders 67.00%      
Number of shares issued   124,000,000   119,707,613