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Finance income (Tables)
 12 Months Ended
Dec. 31, 2020
Finance income [Abstract]  
Finance income
  
2020
£’000
  
2019
£’000
  
2018
£’000
 
Bank interest on cash and cash equivalents
  
668
   
1,386
   
550
 
Interest on short-term deposits
  
-
   
-
   
272
 
Gain on entering into sub-leases on leasehold properties
  
215
   
115
   
-
 
Interest on investment in sub-lease
  
38
   
9
   
-
 
Gain from change in fair value of derivative liability
  
1,287
   
-
   
-
 
Gain from change in fair value of derivative asset
  
-
   
-
   
318
 
   
2,208
   
1,510
   
1,140