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Finance income (costs) (Details) - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finance Income Cost [Line Items]      
Related party finance costs £ (483) £ (709)  
Bad debt write-off (14)   £ (15)
Fair value losses   18  
Interest expense on leases (77) (74) (46)
Other finance cost (1) (6) (5)
Total finance costs (575) (807) (66)
Fair value gains 32,578    
Other finance income 12    
Total finance income 32,590    
Total finance income/(cost) 32,015 £ (807) £ (66)
Convertible Senior Secured Notes      
Finance Income Cost [Line Items]      
Fair value gains 26,876    
Warrant liabilities      
Finance Income Cost [Line Items]      
Fair value gains £ 6,817