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Derivative financial liabilities - Convertible Senior Secured Notes (Details)
£ in Thousands
6 Months Ended
Jun. 30, 2023
GBP (£)
Financial liabilities  
Beginning balance £ 143,918
Ending balance 122,394
Convertible Senior Secured Notes | Mudrick  
Financial liabilities  
Beginning balance 115,247
Fair value movements (16,510)
In-kind interest paid 7,963
Exchange differences on translation (5,866)
Ending balance £ 100,834