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Financial instruments - Financial liabilities at fair value through profit or loss (Details)
£ in Thousands
6 Months Ended
Jun. 30, 2023
GBP (£)
$ / shares
Dec. 31, 2022
GBP (£)
Financial instruments    
Carrying Value £ 119,350 £ 138,592
Level 1 | Financial liabilities at fair value through profit and loss category    
Financial instruments    
Carrying Value 2,727 4,961
Level 3 | Financial liabilities at fair value through profit and loss category    
Financial instruments    
Carrying Value 100,834 115,247
Convertible Senior Secured Notes    
Financial instruments    
Carrying Value 100,834 115,247
Convertible Senior Secured Notes | Level 3 | Financial liabilities at fair value through profit and loss category    
Financial instruments    
Carrying Value 100,834 115,247
Warrant liabilities | Level 1 | Financial liabilities at fair value through profit and loss category    
Financial instruments    
Carrying Value £ 2,727 £ 4,961
Value per warrant | $ / shares £ 0.18