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Financial risk management and impairment of financial assets - Credit risk and impairment (Details)
£ in Thousands, $ in Thousands
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
GBP (£)
Financial risk management and impairment of financial assets      
Amount included in cash at bank for short term commitment £ 10,388    
Restricted cash 7,420    
Balances with banks 212,660   £ 839
USD      
Financial risk management and impairment of financial assets      
Balances with banks | $   $ 145,098  
Credit risk      
Financial risk management and impairment of financial assets      
Maximum exposure to credit risk 672   2,799
Allowance account for credit losses of financial assets £ 0   £ 0