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Acquisition of Subsidiaries - Pro-Forma Information (Details) - GBP (£) £ in Thousands | 6 Months Ended | 10 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Velocity Partners |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Pro-forma, revenue since acquisition date | £ 15,281 |  |  |
Pro-forma, profit since acquisition date | £ 2,635 |  |  |
Pro-forma, revenue |  |  | £ 30,383 |
Pro-forma, profit |  |  | £ 4,327 |
ISDC |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Pro-forma, revenue since acquisition date |  | £ 10,338 |  |
Pro-forma, profit since acquisition date |  | £ 1,398 |  |
Pro-forma, revenue |  |  |  | £ 12,262
Pro-forma, profit |  |  |  | £ 1,589

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