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Income tax, Components of income tax, geographical classification (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current tax [Abstract]      
Current tax £ (12,448) £ (21,572) £ (18,222)
Deferred tax [Abstract]      
Deferred tax (819) (686) 1,674
Total income tax credit (13,267) (22,258) (16,548)
Other comprehensive income [Abstract]      
Deferred tax 0 0 (3,509)
Tax charged to other comprehensive income 0 0 (3,634)
United States [Member]      
Current tax [Abstract]      
Current tax, Federal (16) 100 137
Current tax, State 0 15 2
Deferred tax [Abstract]      
Deferred tax, Federal (819) (644) (516)
Deferred tax, State 0 (42) (1)
Other comprehensive income [Abstract]      
Current tax 0 0 0
United Kingdom [Member]      
Current tax [Abstract]      
Current tax (12,432) (21,687) (18,361)
Deferred tax [Abstract]      
Deferred tax 0 0 2,191
Other comprehensive income [Abstract]      
Current tax 0 0 (125)
Deferred tax £ 0 £ 0 £ (3,509)