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Intangible assets
 12 Months Ended
Dec. 31, 2020
Intangible assets [Abstract]  
Intangible assets
10.
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
 

There were no movements on intangible assets for the year ended December 31, 2020 and a nil net book value remains.

Patent and trademarks comprise the purchase of intellectual property from the Company’s predecessor on January 1, 2016. Assets under construction represents the development of bespoke software.

Following a review undertaken during the year ended December 31, 2019, intangible assets with an aggregate value of £306,000 were written-off comprised of £195,000 of computer software and £111,000 of assets under construction.