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Share Options - Valuation Inputs For Options Granted (Details) - GBP (£)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Risk free rate   0.23%
Expected volatility   43.70%
Expected dividends 0.00% 0.00%
Fair value of option (in gbp per share)   £ 3.50