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Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2022
Property, plant and equipment [Abstract]  
Property, plant and equipment
   
Leasehold
properties and
improvements
   
Plant and
equipment
   
Assets
under
construction
   
Total
 
   

£’000
   

£’000
   

£’000
   

£’000
 
Cost:
                               
At January 1, 2021
   
15,810
     
25,983
     
120
     
41,913
 
Additions
   
     
933
     
75
     
1,008
 
Transfers
   
59
     
85
     
(144
)
   
 
Effect of foreign currency translation
   
7
     
(60
)
   
     
(53
)
Disposals
   
(231
)
   
(139
)
   
(35
)
   
(405
)
At December 31, 2021
   
15,645
     
26,802
     
16
     
42,463
 
Additions
   
60
     
1,345
     
382
     
1,787
 
Transfers
   
     
42
     
(42
)
   
 
Effect of foreign currency translation
   
72
     
21
     
     
93
 
Disposals
   
     
(138
)
   
     
(138
)
At December 31, 2022
   
15,777
     
28,072
     
356
     
44,205
 
Depreciation and impairment:
                               
At January 1, 2021
   
7,835
     
20,324
     
     
28,159
 
Depreciation charge for the year
   
2,386
     
3,125
     
     
5,511
 
Effect of foreign currency translation
   
4
     
(44
)
   
     
(40
)
Disposals
   
(41
)
   
(70
)
   
     
(111
)
At December 31, 2021
   
10,184
     
23,335
     
     
33,519
 
Depreciation charge for the year
   
2,083
     
2,221
     
     
4,304
 
Effect of foreign currency translation
   
38
     
10
     
     
48
 
Disposals
   
     
(138
)
   
     
(138
)
At December 31, 2022
   
12,305
     
25,428
     
     
37,733
 
Carrying value:
                               
At December 31, 2022
   
3,472
     
2,644
     
356
     
6,472
 
At December 31, 2021
   
5,461
     
3,467
     
16
     
8,944
 
At January 1, 2021
   
7,975
     
5,659
     
120
     
13,754