v3.25.0.1
Property, plant and equipment - Balance (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Property, plant and equipment    
Balance at the beginning £ 3,821 £ 2,690
Balance at the end 3,078 3,821
Plant and Machinery    
Property, plant and equipment    
Balance at the beginning 396  
Balance at the end 255 396
Leasehold improvements    
Property, plant and equipment    
Balance at the beginning 2,288  
Balance at the end 2,534 2,288
Assets under construction    
Property, plant and equipment    
Balance at the beginning 612  
Balance at the end   612
Office equipment    
Property, plant and equipment    
Balance at the beginning 415  
Balance at the end 191 415
Vehicles    
Property, plant and equipment    
Balance at the beginning 110  
Balance at the end 98 110
Cost or valuation    
Property, plant and equipment    
Balance at the beginning 5,681 3,954
Additions 428 2,102
Disposals (333) (375)
Balance at the end 5,776 5,681
Cost or valuation | Plant and Machinery    
Property, plant and equipment    
Balance at the beginning 465 25
Additions 4 442
Disposals (75) (2)
Balance at the end 394 465
Cost or valuation | Leasehold improvements    
Property, plant and equipment    
Balance at the beginning 3,347 2,716
Additions 401 653
Transfers 578  
Disposals (139) (22)
Balance at the end 4,187 3,347
Cost or valuation | Assets under construction    
Property, plant and equipment    
Balance at the beginning 612  
Additions   612
Transfers (612)  
Balance at the end   612
Cost or valuation | Office equipment    
Property, plant and equipment    
Balance at the beginning 1,137 1,213
Additions 23 275
Transfers 34  
Disposals (119) (351)
Balance at the end 1,075 1,137
Cost or valuation | Vehicles    
Property, plant and equipment    
Balance at the beginning 120  
Additions   120
Balance at the end 120 120
Accumulated depreciation    
Property, plant and equipment    
Balance at the beginning (1,860) (1,264)
Charge for the year 1,088 892
Disposals 250 296
Balance at the end (2,698) (1,860)
Accumulated depreciation | Plant and Machinery    
Property, plant and equipment    
Balance at the beginning (69) (1)
Charge for the year 93 68
Disposals 23  
Balance at the end (139) (69)
Accumulated depreciation | Leasehold improvements    
Property, plant and equipment    
Balance at the beginning (1,059) (601)
Charge for the year 706 468
Disposals 112 10
Balance at the end (1,653) (1,059)
Accumulated depreciation | Office equipment    
Property, plant and equipment    
Balance at the beginning (722) (662)
Charge for the year 277 346
Disposals 115 286
Balance at the end (884) (722)
Accumulated depreciation | Vehicles    
Property, plant and equipment    
Balance at the beginning (10)  
Charge for the year 12 10
Balance at the end £ (22) £ (10)