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Warrant liability (Tables)
6 Months Ended
Jun. 30, 2022
Text block [abstract]  
Summary of Warrant Liability
    
June 30,
2022
£’000
    
June 30,
   2021 £’000  
 
At January 1
  
 
8,336
 
  
 
50,775
 
    
 
 
    
 
 
 
Warrants exercised
     —          (2,400
Fair value changes during the period
     (1,210      (14,364
    
 
 
    
 
 
 
At June 30
  
 
7,126
 
  
 
34,011
 
    
 
 
    
 
 
 
 
 
  
June 30,
2022
£’000
 
  
December 31,
2021

£’000
 
Current
     6,904        —    
Non-current
     222        8,336  
    
 
 
    
 
 
 
Total
  
 
7,126
 
  
 
8,336
 
    
 
 
    
 
 
 
Summary of Weighted Average Inputs to the Models Used for the Fair Value of Warrants Granted
The following table lists the weighted average inputs to the models used for the fair value of warrants:
 
    
June 30, 2022
    
December 31, 2021
 
Expected volatility (%)
     116        75  
Risk-free interest rate (%)
     2.4        0.9  
Expected life of share options (years)
     1.0        1.5  
Market price of ADS($)
     1.12        1.60  
Model used
    
Black-Scholes
      
Black-Scholes