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Intangible assets (Details) - GBP (£)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance £ 0 £ 318,000
Write-offs   (306,000)
Intangible assets, ending balance 0 0
Patents [Member]    
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance 0 0
Intangible assets, ending balance 0 0
Computer Software [Member]    
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance 0 305,000
Write-offs   (195,000)
Intangible assets, ending balance 0 0
Assets under Construction [Member]    
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance 0 13,000
Write-offs   (111,000)
Intangible assets, ending balance 0 0
Cost [Member]    
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance 516,000 1,396,000
Additions 0 198,000
Transferred 0 0
Write-offs 0 (1,078,000)
Intangible assets, ending balance 516,000 516,000
Cost [Member] | Patents [Member]    
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance 516,000 516,000
Additions 0 0
Transferred 0 0
Write-offs 0 0
Intangible assets, ending balance 516,000 516,000
Cost [Member] | Computer Software [Member]    
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance 0 867,000
Additions 0 76,000
Transferred 0 24,000
Write-offs 0 (967,000)
Intangible assets, ending balance 0 0
Cost [Member] | Assets under Construction [Member]    
Reconciliation of changes in intangible assets other than goodwill [Abstract]    
Intangible assets, beginning balance 0 13,000
Additions 0 122,000
Transferred 0 (24,000)
Write-offs 0 (111,000)
Intangible assets, ending balance 0 0
Amortization and Impairment [Member]    
Amortization and impairments [Abstract]    
Intangible assets, beginning balance 516,000 1,078,000
Write-offs 0 (772,000)
Amortization for the year 0 210,000
Intangible assets, ending balance 516,000 516,000
Amortization and Impairment [Member] | Patents [Member]    
Amortization and impairments [Abstract]    
Intangible assets, beginning balance 516,000 516,000
Write-offs 0 0
Amortization for the year 0 0
Intangible assets, ending balance 516,000 516,000
Amortization and Impairment [Member] | Computer Software [Member]    
Amortization and impairments [Abstract]    
Intangible assets, beginning balance 0 562,000
Write-offs 0 (772,000)
Amortization for the year 0 210,000
Intangible assets, ending balance 0 0
Amortization and Impairment [Member] | Assets under Construction [Member]    
Amortization and impairments [Abstract]    
Intangible assets, beginning balance 0 0
Write-offs 0 0
Amortization for the year 0 0
Intangible assets, ending balance £ 0 £ 0