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Financial Instruments - Summary of Financial Assets and Liabilities in Foreign Currencies (Details) - GBP (£)
£ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financial assets        
Prepayments, accrued income and other receivables £ 3,050 £ 3,634    
Current income tax receivable 4,225 2,195 £ 1,182  
Cash and cash equivalents 86,703 19,990 £ 14,112 £ 18,761
Financial liabilities        
Trade payables 1,120 728    
Payroll taxes and social security 157 61    
Accrued expenditure 1,640 1,184    
Currency Risk        
Financial assets        
Prepayments, accrued income and other receivables 2,656 3,068    
Current income tax receivable 18 54    
Cash and cash equivalents 72,645 251    
Financial liabilities        
Trade payables 148 126    
Payroll taxes and social security 3      
Accrued expenditure £ 468 £ 167