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Financial risk management and impairment of financial assets - Credit risk and impairment (Details)
£ in Thousands, $ in Thousands
Jun. 30, 2023
GBP (£)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
GBP (£)
Financial risk management and impairment of financial assets      
Restricted cash £ 7,865    
USD      
Financial risk management and impairment of financial assets      
Balances with banks | $   $ 24,963  
Credit risk      
Financial risk management and impairment of financial assets      
Maximum exposure to credit risk 1,811   £ 790
Credit risk | Trade receivables      
Financial risk management and impairment of financial assets      
Allowance account for credit losses of financial assets £ 0   £ 0