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Summary of significant accounting policies - Effect of IBOR reform (Details)
£ in Thousands
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Disclosure of detailed information about financial instruments      
Carrying value of assets which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark £ 2,458    
Carrying value of liabilities which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark (183,191)    
Borrowings      
Disclosure of detailed information about financial instruments      
Carrying value of liabilities which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark (183,191)    
Derivative financial instruments      
Disclosure of detailed information about financial instruments      
Carrying value of assets which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark £ 2,458    
Secured term loan facility      
Disclosure of detailed information about financial instruments      
Notional amount | $   $ 225,000,000 $ 225,000,000