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Financial instruments, Other non-current financial assets (Details) - GBP (£)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other non-current financial assets [Abstract]    
Lease security deposit for buildings £ 786,000 £ 2,532,000
Other Non-current Financial Assets [Member]    
Other non-current financial assets [Abstract]    
Lease security deposit for buildings 786,000 £ 2,532,000
Legal settlement 145,000  
Good faith deposit £ 51,000