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Derivative financial liabilities - Convertible Senior Secured Notes (Details)
£ in Thousands
 12 Months Ended
Dec. 31, 2021
GBP (£)
Disclosure of financial liabilities [line items]  
Balance at end of period £ 112,799
Mudrick  
Disclosure of financial liabilities [line items]  
Balance at beginning of period 0
Issuance of Convertible Senior Secured Notes 141,981
Fair value movements (26,876)
Foreign exchange movements (2,306)
Balance at end of period £ 112,799