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Financial risk management and impairment of financial assets - Maturity analysis (Details) - GBP (£)
£ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Financial risk management and impairment of financial assets    
Derivative and non derivative financial liabilities £ 126,101 £ 210,471
Within 1 year    
Financial risk management and impairment of financial assets    
Derivative and non derivative financial liabilities 16,290 17,511
Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Derivative and non derivative financial liabilities 109,315 192,370
After more than 5 years    
Financial risk management and impairment of financial assets    
Derivative and non derivative financial liabilities 496 590
Trade and other payables    
Financial risk management and impairment of financial assets    
Non derivative financial liabilities 19,576 20,790
Trade and other payables | Within 1 year    
Financial risk management and impairment of financial assets    
Non derivative financial liabilities 15,585 16,868
Trade and other payables | Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Non derivative financial liabilities 3,991 3,922
Lease liabilities    
Financial risk management and impairment of financial assets    
Non derivative financial liabilities 2,610 2,620
Lease liabilities | Within 1 year    
Financial risk management and impairment of financial assets    
Non derivative financial liabilities 705 643
Lease liabilities | Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Non derivative financial liabilities 1,409 1,387
Lease liabilities | After more than 5 years    
Financial risk management and impairment of financial assets    
Non derivative financial liabilities 496 590
Convertible senior secured notes    
Financial risk management and impairment of financial assets    
Derivative financial liabilities 103,915 187,061
Convertible senior secured notes | Between 2 and 5 years    
Financial risk management and impairment of financial assets    
Derivative financial liabilities £ 103,915 £ 187,061