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Financial risk management and impairment of financial assets - Liquidity risk (Details) - GBP (£)
£ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial risk management and impairment of financial assets    
Financial obligations £ 160,943 £ 9,982
Less than one year    
Financial risk management and impairment of financial assets    
Financial obligations 40,589 8,885
Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Financial obligations 120,117 700
More than 5 years    
Financial risk management and impairment of financial assets    
Financial obligations 237 397
Trade and other payables .    
Financial risk management and impairment of financial assets    
Financial obligations 46,202 2,401
Trade and other payables . | Less than one year    
Financial risk management and impairment of financial assets    
Financial obligations 40,227 2,401
Trade and other payables . | Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Financial obligations 5,975  
Lease liabilities.    
Financial risk management and impairment of financial assets    
Financial obligations 1,942 1,272
Lease liabilities. | Less than one year    
Financial risk management and impairment of financial assets    
Financial obligations 362 175
Lease liabilities. | Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Financial obligations 1,343 700
Lease liabilities. | More than 5 years    
Financial risk management and impairment of financial assets    
Financial obligations 237 397
Convertible Senior Secured Notes    
Financial risk management and impairment of financial assets    
Financial obligations 112,799  
Convertible Senior Secured Notes | Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Financial obligations £ 112,799  
Other borrowings    
Financial risk management and impairment of financial assets    
Financial obligations   6,309
Other borrowings | Less than one year    
Financial risk management and impairment of financial assets    
Financial obligations   £ 6,309