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Finance costs (Tables)
 12 Months Ended
Dec. 31, 2020
Finance costs [Abstract]  
Finance costs
  
2020
£’000
  
2019
£’000
  
2018
£’000
 
Interest on lease liabilities
  
2,401
   
2,947
   
-
 
Interest expenses on financial liabilities measured at amortized cost
  
708
   
849
   
842
 
Loss from change in fair value of embedded derivative asset
  
266
   
454
   
-
 
Loss from change in fair value of derivative liability
  
-
   
5,127
   
-
 
Other finance costs
  
-
   
2
   
-
 
   
3,375
   
9,379
   
842