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Borrowings (Details)
6 Months Ended
Dec. 31, 2024
GBP (£)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
USD ($)
Disclosure of detailed information about borrowings            
Total borrowings £ 731,465,000   £ 546,621,000   £ 773,301,000  
Non-current borrowings 515,719,000   511,047,000   506,509,000  
Current borrowings 215,746,000   35,574,000   266,792,000  
Senior secured notes            
Disclosure of detailed information about borrowings            
Total borrowings 337,614,000   334,538,000   331,572,000  
Non-current borrowings 337,614,000   334,538,000   331,572,000  
Unamortized issue costs on borrowings 1,359,000   1,615,000   1,866,000  
Principal amount / Notional amount | $   $ 425,000,000   $ 425,000,000   $ 425,000,000
Secured term loan facility            
Disclosure of detailed information about borrowings            
Total borrowings 178,105,000   176,509,000   174,937,000  
Non-current borrowings 178,105,000   176,509,000   174,937,000  
Unamortized issue costs on borrowings 1,321,000   1,456,000   1,589,000  
Principal amount / Notional amount | $   $ 225,000,000   $ 225,000,000   $ 225,000,000
Revolving facilities            
Disclosure of detailed information about borrowings            
Total borrowings 210,000,000   30,000,000   260,000,000  
Undrawn borrowing facilities 90,000,000   270,000,000   40,000,000  
Accrued interest on senior secured notes and revolving credit facilities            
Disclosure of detailed information about borrowings            
Total borrowings £ 5,746,000   £ 5,574,000   £ 6,792,000  
Fixed interest rate | Senior secured notes            
Disclosure of detailed information about borrowings            
Borrowings, interest rate 3.79% 3.79%        
Floating interest rate | Secured term loan facility            
Disclosure of detailed information about borrowings            
Borrowings, interest rate basis LIBOR          
Minimum | Floating interest rate | Secured term loan facility            
Disclosure of detailed information about borrowings            
Adjustment to interest rate basis 1.25% 1.25%        
Maximum | Floating interest rate | Secured term loan facility            
Disclosure of detailed information about borrowings            
Adjustment to interest rate basis 1.75% 1.75%