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Basis of preparation (Details)
Dec. 31, 2024
GBP (£)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
USD ($)
Going concern            
Cash resources £ 95,542,000   £ 73,549,000   £ 62,809,000  
Borrowings 731,465,000   546,621,000   773,301,000  
Revolving facilities            
Going concern            
Undrawn borrowing facilities 90,000,000   270,000,000   40,000,000  
Borrowings 210,000,000   30,000,000   260,000,000  
Senior secured notes            
Going concern            
Principal amount / Notional amount | $   $ 425,000,000   $ 425,000,000   $ 425,000,000
Borrowings 337,614,000   334,538,000   331,572,000  
Secured term loan facility            
Going concern            
Principal amount / Notional amount | $   $ 225,000,000   $ 225,000,000   $ 225,000,000
Borrowings £ 178,105,000   £ 176,509,000   £ 174,937,000