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Share capital (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2024
GBP (£)
Vote
item
shares
Jun. 30, 2024
USD ($)
Vote
item
shares
Jun. 30, 2023
GBP (£)
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Ordinary shares        
Balance at the beginning | £ £ 53,000      
Issue of shares | £ 158,541,000      
Balance at the end | £ £ 55,000   £ 53,000  
Number of class of ordinary shares | item 2 2    
Number of class A shares to which one B share is convertible 1 1    
Proportion of affirmative votes required for special resolutions 66.67% 66.67%    
Treasury shares | £ £ 21,305,000   £ 21,305,000  
Trawlers Limited investment        
Ordinary shares        
Issue of shares | $   $ 200    
Subscription price for shares subscribed for before 31 December 2024 | $       $ 100
Ordinary shares        
Number of shares        
Balance at the beginning (in shares) 164,842,000 164,842,000 164,745,000  
Balance at the end (in shares) 171,001,000 171,001,000 164,842,000  
Ordinary shares        
Balance at the beginning | £ £ 53,000   £ 53,000  
Balance at the end | £ £ 55,000   £ 53,000  
Ordinary shares | Employee share-based compensation awards        
Number of shares        
Issue of shares (in shares) 98,000 98,000 97,000  
Ordinary shares        
Issue of shares | £ £ 0   £ 0  
Ordinary shares | Trawlers Limited investment        
Number of shares        
Issue of shares (in shares) 6,061,000 6,061,000    
Ordinary shares        
Issue of shares | £ £ 2,000      
Class A ordinary shares        
Number of shares        
Balance at the beginning (in shares) 54,634,231 54,634,231    
Balance at the end (in shares) 56,699,344 56,699,344 54,634,231  
Ordinary shares        
Par value per ordinary share (in dollars per share) | $ / shares       $ 0.0005
Number of voting right per share | Vote 1 1    
Number of shares held in treasury 1,682,896     1,682,896
Treasury shares | £ £ 21,305,000      
Class A ordinary shares | Trawlers Limited investment        
Number of shares        
Issue of shares (in shares) 1,966,899 1,966,899    
Ordinary shares        
Number of shares to be subscribed for before 31 December 2024 983,450     983,450
Class B ordinary shares        
Number of shares        
Balance at the beginning (in shares) 110,207,613 110,207,613    
Balance at the end (in shares) 114,301,320 114,301,320 110,207,613  
Ordinary shares        
Par value per ordinary share (in dollars per share) | $ / shares       $ 0.0005
Number of voting right per share | Vote 10 10    
Percentage of ordinary shares outstanding below which Class B shares will convert to Class A 10.00% 10.00%    
Percentage of voting power of shareholders 67.00% 67.00%    
Class B ordinary shares | Trawlers Limited investment        
Number of shares        
Issue of shares (in shares) 4,093,707 4,093,707    
Ordinary shares        
Number of shares to be subscribed for before 31 December 2024 2,046,854     2,046,854