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Trade and Other Receivables (Details) - GBP (£)
£ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Trade and Other Receivables [Line Items]    
Trade receivables £ 26,005 £ 30,236
Prepayments 4,259 2,095
Accrued income 17,147 5,367
Research and development tax credit 2,088 2,933
Grant receivable 816 0
Other receivables 2,037 863
Total trade and other receivables 52,352 41,494
Trade receivables - gross    
Disclosure of Trade and Other Receivables [Line Items]    
Trade receivables 26,431 30,401
Provision for impairment    
Disclosure of Trade and Other Receivables [Line Items]    
Trade receivables £ (426) £ (165)