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Summary of significant accounting policies - Basis of preparation (Details)
Jul. 10, 2025
GBP (£)
Jun. 30, 2025
GBP (£)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Going concern          
Cash resources   £ 86,105,000   £ 73,549,000  
Borrowings   636,974,000   546,621,000  
Senior secured notes          
Going concern          
Principal amount / Notional amount | $     $ 425,000,000   $ 425,000,000
Borrowings   308,914,000   334,538,000  
Secured term loan facility          
Going concern          
Principal amount / Notional amount | $     $ 225,000,000   $ 225,000,000
Borrowings   162,941,000   176,509,000  
Revolving facilities          
Going concern          
Undrawn borrowing facilities   140,000,000   270,000,000  
Principal amount / Notional amount   300,000,000      
Borrowings   £ 160,000,000   £ 30,000,000  
Revolving facilities | Revolving facilities upsize and extension          
Going concern          
Principal amount / Notional amount £ 350,000,000