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Share-based payments - Derivative financial liabilities (Details) - GBP (£)
£ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial liabilities [line items]    
Derivative financial liabilities £ 112,799  
Mudrick    
Disclosure of financial liabilities [line items]    
Derivative financial liabilities £ 112,799 £ 0