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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2020
Intangible assets [Abstract]  
Intangible assets
  
Patents £'000
  
Computer
software £’000
  
Assets under
construction
£’000
  
Total £’000
 
Cost:
            
At January 1, 2019
  
516
   
867
   
13
   
1,396
 
Additions
  
-
   
76
   
122
   
198
 
Transferred
  
-
   
24
   
(24
)
  
-
 
Write-offs
  
-
   
(967
)
  
(111
)
  
(1,078
)
At December 31, 2019
  
516
   
-
   
-
   
516
 
Additions
  
-
   
-
   
-
   
-
 
Transferred
  
-
   
-
   
-
   
-
 
Write-offs
  
-
   
-
   
-
   
-
 
At December 31, 2020
  
516
   
-
   
-
   
516
 
Amortization and impairment:
                
At January 1, 2019
  
516
   
562
   
-
   
1,078
 
Write-offs
  
-
   
(772
)
  
-
   
(772
)
Amortization for the year
  
-
   
210
   
-
   
210
 
At December 31, 2019
  
516
   
-
   
-
   
516
 
                 
Write-offs
  
-
   
-
   
-
   
-
 
Amortization for the year
  
-
   
-
   
-
   
-
 
At December 31, 2020
  
516
   
-
   
-
   
516
 
Carrying value:
                
At December 31, 2020
  
-
   
-
   
-
   
-
 
At December 31, 2019
  
-
   
-
   
-
   
-
 
At January 1, 2019
  
-
   
305
   
13
   
318