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Accounting policies - Effect of IBOR reform (Details)
£ in Thousands
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Accounting policies        
Carrying value of assets which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark £ 4,901      
Carrying value of liabilities which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark (185,028)      
Borrowings        
Accounting policies        
Carrying value of liabilities which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark (185,028)      
Derivative financial instruments        
Accounting policies        
Carrying value of assets which reference USD LIBOR and have not yet transitioned to an alternative interest rate benchmark £ 4,901      
Secured term loan facility        
Accounting policies        
Notional Amount | $   $ 225,000,000 $ 225,000,000 $ 225,000,000