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Derivative financial liabilities - Convertible Senior Secured Notes (Details)
£ in Thousands
 6 Months Ended
Jun. 30, 2022
GBP (£)
Disclosure of financial liabilities [line items]  
Balance at beginning of period £ 112,799
Balance at end of period 92,450
Mudrick  
Disclosure of financial liabilities [line items]  
Balance at beginning of period 112,799
Fair value movements (38,124)
Interest paid 7,005
Exchange differences on translation 10,770
Balance at end of period £ 92,450