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Financial instruments - Additional Information (Details)
£ in Thousands
12 Months Ended
Dec. 16, 2021
GBP (£)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
$ / shares
Dec. 31, 2020
GBP (£)
Disclosure of financial liabilities [line items]        
Total interest expense for financial liabilities not held at fair value through profit or loss   £ 747   £ 801
Exercise price | $ / shares     $ 18  
Risk-free interest rate (%)   0.28%   (0.13%)
Expected volatility (%)   50.00%   50.00%
Convertible note and warrants        
Disclosure of financial liabilities [line items]        
Estimated fair value £ 141,981      
Percentage of discount for face value 4.00%      
Debt discount face amount £ 151,000      
Fair value of debt issuance price 145,000      
Convertible note        
Disclosure of financial liabilities [line items]        
Fair value of convertible note estimated £ 141,981 £ 112,799    
Exercise price | $ / shares     $ 6.73  
Risk-free interest rate (%)   1.25%    
Expected volatility (%)   52.50%    
Credit spread 2,179 2,179    
Dividend yield   0.00%