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Financial risk management and impairment of financial assets (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
GBP (£)
Financial risk management and impairment of financial assets          
Restricted cash £ 8,235   £ 7,420    
Cash deposits held     212,660   £ 839
USD          
Financial risk management and impairment of financial assets          
Cash deposits held | $   $ 47,999   $ 145,098  
Credit risk          
Financial risk management and impairment of financial assets          
Maximum exposure to credit risk 9,248   672   2,799
Allowance account for credit losses of financial assets     0   £ 0
Credit risk | Trade receivables          
Financial risk management and impairment of financial assets          
Allowance account for credit losses of financial assets £ 0   £ 0