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Summary of significant accounting policies - Basis of preparation (Details)
Jun. 30, 2023
GBP (£)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Going concern        
Cash resources £ 76,019,000   £ 121,223,000  
Borrowings 613,296,000   636,122,000  
Senior secured notes        
Going concern        
Principal amount / Notional amount | $   $ 425,000,000   $ 425,000,000
Borrowings 332,112,000   347,173,000  
Secured term loan facility        
Going concern        
Principal amount / Notional amount | $   $ 225,000,000   $ 225,000,000
Borrowings 175,223,000   183,192,000  
Revolving facilities        
Going concern        
Undrawn borrowing facilities 200,000,000   200,000,000  
Principal amount / Notional amount 300,000,000      
Borrowings 100,000,000   £ 100,000,000  
Revolving facilities | 4 April 2025        
Going concern        
Principal amount / Notional amount 150,000,000      
Revolving facilities | 25 June 2027        
Going concern        
Principal amount / Notional amount £ 150,000,000