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Derivative financial liabilities - Additional Information (Details)
£ in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Dec. 16, 2021
GBP (£)
shares
Dec. 16, 2021
USD ($)
shares
Jun. 30, 2021
GBP (£)
Dec. 31, 2021
GBP (£)
shares
Dec. 31, 2021
USD ($)
shares
Jun. 30, 2022
GBP (£)
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      
Restricted cash | £       £ 7,420   £ 8,235    
Convertible loan notes                
Disclosure of financial liabilities [line items]                
Convertible shares       18,181,820 18,181,820      
Conversion ratio per $1000 principal amount       90.9091     90.9091  
Additional interest rate       2.00%     2.00%  
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 | Convertible loan notes                
Disclosure of financial liabilities [line items]                
Debt discount face amount £ 151,000     £ 151,000     $ 200,000 $ 200,000
Aggregate purchase price £ 145,000 $ 192,000   145,000 $ 192,000      
Convertible shares 18,181,820 18,181,820            
Conversion ratio per $1000 principal amount 90.9091             90.9091
Convertible Senior Secured Notes Principal Amount       756     $ 1,000  
Interest rate           9.00%    
Microsoft and Rocket                
Disclosure of financial liabilities [line items]                
Aggregate purchase price | £       £ 25,000