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Financial Assets and Liabilities - Financial Assets (Details) - Level 3 - GBP (£)
£ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Disclosure of financial assets [line items]    
Financial assets £ 67,400 £ 65,065
Trade and other receivables    
Disclosure of financial assets [line items]    
Financial assets 52,352 41,494
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets £ 15,048 £ 23,571