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Financial risk management and impairment of financial assets - Maturity analysis (Details) - GBP (£)
£ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial risk management and impairment of financial assets      
Trade and other payables £ 16,515 £ 46,202  
Lease liabilities 2,109 1,942  
Convertible senior secured notes 92,450 112,799  
Total financial obligations 111,074 160,943 £ 9,982
Within 1 year      
Financial risk management and impairment of financial assets      
Trade and other payables 9,785 40,227  
Lease liabilities 426 362  
Total financial obligations 10,211 40,589 8,885
Between 2 and 5 years      
Financial risk management and impairment of financial assets      
Trade and other payables 6,730 5,975  
Lease liabilities 1,515 1,343  
Convertible senior secured notes 92,450 112,799  
Total financial obligations 100,695 120,117 700
More than 5 years      
Financial risk management and impairment of financial assets      
Lease liabilities 168 237  
Total financial obligations £ 168 237 397
Trade and other payables [Member]      
Financial risk management and impairment of financial assets      
Total financial obligations   46,202 2,401
Trade and other payables [Member] | Within 1 year      
Financial risk management and impairment of financial assets      
Total financial obligations   40,227 £ 2,401
Trade and other payables [Member] | Between 2 and 5 years      
Financial risk management and impairment of financial assets      
Total financial obligations   5,975  
Convertible Senior Secured Notes      
Financial risk management and impairment of financial assets      
Total financial obligations   112,799  
Convertible Senior Secured Notes | Between 2 and 5 years      
Financial risk management and impairment of financial assets      
Total financial obligations   £ 112,799