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Share capital (Details)
 6 Months Ended
Dec. 31, 2022
GBP (£)
Vote
item
shares
Jun. 30, 2022
GBP (£)
shares
Dec. 31, 2021
GBP (£)
shares
Dec. 31, 2022
$ / shares
Dec. 31, 2022
GBP (£)
shares
Ordinary shares          
Balance at the beginning | £ £ 53,000 £ 53,000      
Balance at the end | £ £ 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 | shares 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) | shares 164,745,000 164,686,000 164,677,000    
Employee share-based compensation awards - issue of shares (in shares) | shares 0 59,000 9,000    
Balance at the end (in shares) | shares 164,745,000 164,745,000 164,686,000    
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    
Class A ordinary shares          
Number of shares          
Balance at the end (in shares) | shares 54,537,360        
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 held in treasury | shares         1,682,896
Treasury shares | £         £ 21,305,000
Class B ordinary shares          
Number of shares          
Balance at the end (in shares) | shares 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%