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Share capital (Details)
 12 Months Ended
Jun. 30, 2022
GBP (£)
Vote
item
shares
Jun. 30, 2021
GBP (£)
shares
Jun. 30, 2022
$ / shares
Jun. 30, 2022
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) 164,677,000 164,622,000    
Employee share-based compensation awards - issue of shares (in shares) 68,000 55,000    
Balance at the end (in shares) 164,745,000 164,677,000    
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        
Number of shares        
Balance at the beginning (in shares) 44,969,701      
Balance at the end (in shares) 54,537,360 44,969,701    
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 on conversion 9,500,000      
Number of shares held in treasury       1,682,896
Treasury shares | £       £ 21,305,000
Class B ordinary shares        
Number of shares        
Balance at the beginning (in shares) 119,707,613      
Balance at the end (in shares) 110,207,613 119,707,613    
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%