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Basis of preparation (Details)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Going concern            
Cash resources £ 31,045,000   £ 121,223,000   £ 87,434,000  
Borrowings 741,900,000   636,122,000   582,237,000  
Senior secured notes            
Going concern            
Principal amount / Notional amount | $   $ 425,000,000   $ 425,000,000   $ 425,000,000
Borrowings 350,626,000   347,173,000   312,318,000  
Secured term loan facility            
Going concern            
Principal amount / Notional amount | $   $ 225,000,000   $ 225,000,000   $ 225,000,000
Borrowings 185,028,000   183,192,000   164,734,000  
Revolving facilities            
Going concern            
Undrawn borrowing facilities 100,000,000   200,000,000   100,000,000  
Principal amount / Notional amount 300,000,000          
Borrowings 200,000,000   £ 100,000,000   £ 100,000,000  
Revolving facilities | 2025            
Going concern            
Principal amount / Notional amount 150,000,000          
Revolving facilities | 2027            
Going concern            
Principal amount / Notional amount £ 150,000,000