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Financial risk management and impairment of financial assets - Liquidity risk (Details) - GBP (£)
£ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial risk management and impairment of financial assets      
Financial obligations £ 111,074 £ 160,943 £ 9,982
Within 1 year      
Financial risk management and impairment of financial assets      
Financial obligations 10,211 40,589 8,885
Between 2 and 5 years      
Financial risk management and impairment of financial assets      
Financial obligations 100,695 120,117 700
More than 5 years      
Financial risk management and impairment of financial assets      
Financial obligations £ 168 237 397
Trade and other payables [Member]      
Financial risk management and impairment of financial assets      
Financial obligations   46,202 2,401
Trade and other payables [Member] | Within 1 year      
Financial risk management and impairment of financial assets      
Financial obligations   40,227 2,401
Trade and other payables [Member] | 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. | Within 1 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 loan notes      
Financial risk management and impairment of financial assets      
Financial obligations   112,799  
Convertible loan 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 | Within 1 year      
Financial risk management and impairment of financial assets      
Financial obligations     £ 6,309