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Share capital (Details)
 3 Months Ended 6 Months Ended
Dec. 31, 2021
GBP (£)
shares
Dec. 31, 2021
GBP (£)
item
Vote
shares
Jun. 30, 2021
GBP (£)
shares
Dec. 31, 2020
GBP (£)
shares
Dec. 31, 2021
$ / shares
Dec. 31, 2021
GBP (£)
shares
Ordinary shares            
Balance at the beginning | £   £ 53,000 £ 53,000      
Balance at the end | £ £ 53,000 £ 53,000 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   £ 21,305,000
Ordinary shares            
Number of shares            
Balance at the beginning (in shares)   164,677,000 164,622,000 164,622,000    
Employee share-based compensation awards - issue of shares (in shares)   9,000 55,000 0    
Balance at the end (in shares) 164,686,000 164,686,000 164,677,000 164,622,000    
Ordinary shares            
Balance at the beginning | £   £ 53,000 £ 53,000 £ 53,000    
Employee share-based compensation awards - issue of shares | £   0 0 0    
Balance at the end | £ £ 53,000 £ 53,000 £ 53,000 £ 53,000    
Class A ordinary shares            
Number of shares            
Balance at the end (in shares) 54,478,046 54,478,046        
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 end (in shares) 110,207,613 110,207,613        
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%