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Finance income(costs) (Details) - GBP (£)
£ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Finance income costs Line Items          
Interest paid on convertible loan notes £ (7,005)        
Interest on loans from related parties   £ (483)      
Foreign exchange loss (12,981)        
Fair value movements   (3)      
Interest expense on leases (67) (34) £ (77) £ (74) £ (46)
Other (10)   (1) (6) (5)
Total finance costs (20,063) £ (520) (575) £ (807) £ (66)
Total finance income 42,497   £ 32,590    
Convertible Senior Secured Notes          
Disclosure Of Finance income costs Line Items          
Fair value movements 38,124        
Warrant liabilities          
Disclosure Of Finance income costs Line Items          
Fair value movements £ 4,373