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Share capital (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2025
GBP (£)
item
Vote
shares
Jun. 30, 2025
USD ($)
item
Vote
$ / shares
shares
Jun. 30, 2024
GBP (£)
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2025
GBP (£)
shares
Ordinary shares          
Balance at the beginning | £ £ 55,000        
Issue of shares | £ 79,985,000   £ 158,541,000    
Balance at the end | £ £ 56,000   55,000    
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 | $   $ 100   $ 200  
Ordinary shares          
Number of shares          
Balance at the beginning (in shares) 171,001,000 171,001,000 164,842,000 164,842,000  
Balance at the end (in shares) 174,112,000 174,112,000 171,001,000 171,001,000  
Ordinary shares          
Balance at the beginning | £ £ 55,000   £ 53,000    
Balance at the end | £ £ 56,000   £ 55,000    
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    
Ordinary shares | INEOS Limited investment          
Number of shares          
Issue of shares (in shares) 3,030,000 3,030,000      
Ordinary shares          
Issue of shares | £ £ 1,000        
Ordinary shares | Employee share-based compensation awards          
Number of shares          
Issue of shares (in shares) 81,000 81,000 98,000 98,000  
Class A ordinary shares          
Number of shares          
Balance at the beginning (in shares) 56,699,344 56,699,344      
Balance at the end (in shares) 57,763,582 57,763,582 56,699,344 56,699,344  
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
Treasury shares | £         £ 21,305,000
Class A ordinary shares | Trawlers Limited investment          
Number of shares          
Issue of shares (in shares) 983,450 983,450 1,966,899 1,966,899  
Class B ordinary shares          
Number of shares          
Balance at the beginning (in shares) 114,301,320 114,301,320      
Balance at the end (in shares) 116,348,173 116,348,173 114,301,320 114,301,320  
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) 2,046,854 2,046,854 4,093,707 4,093,707