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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2020
Property, plant and equipment [Abstract]  
Property, plant and equipment
  
Leasehold
properties and improvements
£’000
  
Plant and
 equipment
£’000
  
Assets under
construction
£’000
  
Total
£’000
 
Cost:
            
At January 1, 2019
  
11,137
   
25,639
   
989
   
37,765
 
Additions
  
215
   
1,150
   
2,713
   
4,078
 
Transfers
  
1,090
   
41
   
(1,131
)
  
-
 
Effect of foreign currency translation
  
(17
)
  
(4
)
  
-
   
(21
)
Disposals
  
(185
)
  
(500
)
  
-
   
(685
)
At December 31, 2019
  
12,240
   
26,326
   
2,571
   
41,137
 
Additions
  
564
   
775
   
1,735
   
3,074
 
Transfers
  
4,123
   
2
   
(4,125
)
  
-
 
Effect of foreign currency translation
  
(27
)
  
(2
)
  
-
   
(29
)
Disposals
  
(1,090
)
  
(1,118
)
  
(61
)
  
(2,269
)
At December 31, 2020
  
15,810
   
25,983
   
120
   
41,913
 
Depreciation and impairment:
                
At January 1, 2019
  
3,752
   
13,139
   
-
   
16,891
 
Depreciation charge for the year
  
2,047
   
4,502
   
-
   
6,549
 
Effect of foreign currency translation
  
(2
)
  
(3
)
  
-
   
(5
)
Disposals
  
(155
)
  
(445
)
  
-
   
(600
)
At December 31, 2019
  
5,642
   
17,193
   
-
   
22,835
 
                 
Depreciation charge for the year
  
2,356
   
4,090
   
-
   
6,446
 
Effect of foreign currency translation
  
(7
)
  
(67
)
  
-
   
(74
)
Disposals
  
(156
)
  
(892
)
  
-
   
(1,048
)
At December 31, 2020
  
7,835
   
20,324
   
-
   
28,159
 
Carrying value:
                
At December 31, 2020
  
7,975
   
5,659
   
120
   
13,754
 
At December 31, 2019
  
6,698
   
9,133
   
2,571
   
18,302
 
At January 1, 2019
  
7,385
   
12,500
   
989
   
20,874