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Financial Instruments Risk Management - Summary of Financial Assets and Liabilities in Foreign Currencies, Primarily Held in U.S Dollars (Details) - GBP (£)
£ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial assets        
Current income tax receivable £ 9,822 £ 8,481 £ 4,263  
Cash and cash equivalents 87,356 51,962 76,972 £ 86,703
Financial liabilities        
Payroll taxes and social security 177 160    
Lease liabilities 645 806 £ 434  
Accrued expenditure 5,437 3,342    
Currency Risk [member]        
Financial assets        
Prepayments, accrued income and other receivables 2,079 2,174    
Current income tax receivable 4 4    
Cash and cash equivalents 70,419 28,980    
Financial liabilities        
Trade payables 409 549    
Payroll taxes and social security 1 18    
Lease liabilities 105 52    
Accrued expenditure £ 926 £ 989