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Derivative financial liabilities - Additional Information (Details)
£ in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 15, 2022
GBP (£)
Jun. 15, 2022
USD ($)
Dec. 16, 2021
GBP (£)
shares
Dec. 16, 2021
USD ($)
shares
Jun. 30, 2022
GBP (£)
Jun. 30, 2021
GBP (£)
Dec. 31, 2021
GBP (£)
shares
Dec. 31, 2021
USD ($)
shares
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
shares
Dec. 16, 2021
USD ($)
shares
Disclosure of financial liabilities [line items]                      
Aggregate purchase price | £           £ 25,000 £ 166,981        
Limitation on restricted payments for retention guarantors | $               $ 10,000      
Convertible loan notes                      
Disclosure of financial liabilities [line items]                      
Convertible shares | shares             18,181,820 18,181,820      
Conversion ratio per $1000 principal amount | shares             90.9091     90.9091  
Convertible loan notes | Interest paid in cash                      
Disclosure of financial liabilities [line items]                      
Interest rate             7.00%     7.00%  
Convertible loan notes | Interest paid in-kind and semi-annually in arrears                      
Disclosure of financial liabilities [line items]                      
Interest rate             9.00%     9.00%  
Mudrick                      
Disclosure of financial liabilities [line items]                      
Increase through accumulating interest | £         £ 7,005            
Mudrick | Convertible loan notes                      
Disclosure of financial liabilities [line items]                      
Principal amount     £ 151,000       £ 151,000     $ 200,000 $ 200,000
Aggregate purchase price     £ 145,000 $ 192,000     145,000 $ 192,000      
Convertible shares | shares     18,181,820 18,181,820              
Conversion ratio per $1000 principal amount | shares     90.9091               90.9091
Convertible Senior Secured Notes Principal Amount             756     $ 1,000  
Denominator in calculation of number of equity instruments holder of convertible debt is entitled to, notional amount     £ 824               $ 1,000
Interest rate         9.00%       9.00%    
Increase through accumulating interest £ 7,005 $ 8,950                  
Mandatory cash balance under loan covenants | $                 $ 10,000    
Restricted cash | £         £ 8,235            
Microsoft and Rocket                      
Disclosure of financial liabilities [line items]                      
Aggregate purchase price | £             £ 25,000