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Acquisition of Subsidiaries - Goodwill (Details) - GBP (£) £ in Thousands | Jun. 30, 2018 | Dec. 29, 2017 | Jun. 30, 2017 | Sep. 02, 2016
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Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill | £ 41,062 |  | £ 16,198 |
Velocity Partners |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Consideration transferred |  | £ 44,887 |  |
Fair value of identifiable net assets |  | (20,675) |  |
Goodwill |  | £ 24,212 |  |
ISDC |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Consideration transferred |  |  |  | £ 8,862
Fair value of identifiable net assets |  |  |  | (4,662)
Goodwill |  |  |  | £ 4,200

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