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Share Options - Company Share Option Plan (Details)
12 Months Ended
Jun. 30, 2018
GBP (£)
shares
year
Jun. 30, 2017
shares
year
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period 5 years  
Company Share Option Plan (CSOP)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period 5 years  
Expiration period 10 years  
Number of share options granted (in shares) 0  
Number of share options exercised (in shares) 0  
Number of share options expired (in shares) 0  
Number of share options forfeited (in shares) 0 51,435
Number of share options outstanding (in shares) 125,545 125,545
Weighted average exercise price of share options (in gbp per share) | £ £ 0.82  
Number of share options exercisable (in shares) 0  
Weighted average remaining contractual life | year 6 7