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Finance income (Details) - GBP (£)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance income [Abstract]      
Bank interest on cash and cash equivalents £ 668,000 £ 1,386,000 £ 550,000
Interest on short-term deposits 0 0 272,000
Gain on entering into sub-leases on leasehold properties 215,000 115,000 0
Interest on investment in sub-lease 38,000 9,000 0
Gain from change in fair value of derivative liability 1,287,000 0 0
Gain from change in fair value of derivative asset 0 0 318,000
Finance income 2,208,000 1,510,000 1,140,000
Credit to equity 3,840,000    
Loss from change in fair value of embedded derivative asset £ 266,000 £ 454,000 £ 0