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Share Options - Long term Incentive Plan (Details) |  | 12 Months Ended
--- | --- | ---
Sep. 07, 2017 GBP (£) shares | Jun. 30, 2018 GBP (£) shares year | Jun. 30, 2017 GBP (£) shares year | Jun. 30, 2016 GBP (£)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period |  | 5 years |  |
Share-based compensation | £ |  | £ 1,505,000 | £ 854,000 | £ 768,000
Long term Incentive Plan (LTIP) |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Banked period |  | 5 years |  |
Vesting period |  | 3 years |  |
Number of share options forfeited (in shares) |  | 35,500 | 167,250 |
Number of share options exercised (in shares) |  | 0 | 0 |
Number of share options expired (in shares) |  | 0 | 0 |
Number of share options granted (in shares) |  | 329,700 | 452,000 |
Number of share options outstanding (in shares) |  | 1,277,700 | 983,500 |
Number of share options exercisable (in shares) |  | 0 |  |
Weighted average remaining contractual life of outstanding share options | year |  | 7 | 8 |
Non-Employee Compensation For Services |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of share options granted (in shares) | 10,000 |  |  |
Weighted average remaining contractual life of outstanding share options | year |  | 5 |  |
Weighted average exercise price of share options (in gbp per share) | £ | £ 4.58 |  |  |
Expiration Period Tranche One | Long term Incentive Plan (LTIP) |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Expiration period |  | 10 years |  |
Expiration Period Tranche Two | Long term Incentive Plan (LTIP) |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Expiration period |  | 5 years |  |

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