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Financial risk management and impairment of financial assets - Maturity analysis (Details) - GBP (£)
£ in Thousands
Jun. 30, 2022
Dec. 31, 2021
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
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
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
More than 5 years    
Financial risk management and impairment of financial assets    
Lease liabilities 168 237
Total financial obligations £ 168 £ 237