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Staff numbers and costs, Aggregate staff costs (Details)
£ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Employee
Dec. 31, 2020
GBP (£)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
GBP (£)
Staff numbers and costs [Abstract]        
Wages and salaries   £ 29,038 £ 31,920 £ 29,501
Social security costs   2,131 2,767 2,731
Share-based payments (Note 25)   8,162 3,056 666
Contributions to defined contribution plans (Note 27)   1,035 1,213 981
Total aggregate staff costs   40,366 £ 38,956 £ 33,879
Corporate Restructuring [Abstract]        
Restructuring costs1   £ 1,200,000    
Reduction in number of employees on completion of restructure | Employee 78