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Staff Costs - Disclosure of Employee Benefit Expense (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Staff Costs [Line Items]      
Share-based payments £ 4,300 £ 3,200 £ 1,800
Total employee benefit expense 9,985 8,407 5,911
Research and Development Expenses      
Staff Costs [Line Items]      
Wages and salaries 3,492 3,304 2,761
Social security costs 430 395 314
Pension costs 189 140 139
Share-based payments 2,412 1,878 835
Total employee benefit expense 6,523 5,717 4,049
Administrative Expenses      
Staff Costs [Line Items]      
Wages and salaries 1,387 1,190 790
Social security costs 135 115 75
Pension costs 47 37 37
Share-based payments 1,893 1,348 960
Total employee benefit expense £ 3,462 £ 2,690 £ 1,862