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Acquisition of Subsidiaries - Allocation of Purchase Consideration to Net Assets Acquired (Details) - GBP (£) £ in Thousands | Dec. 29, 2017 | Sep. 02, 2016
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Velocity Partners |  |
Disclosure of detailed information about business combination [line items] |  |
Intangible asset - Client relationships | £ 15,214 |
Property, plant and equipment | 932 |
Trade and other receivables | 6,045 |
Cash and cash equivalents | 2,342 |
Trade and other payables | (3,792) |
Corporation tax payable | (39) |
Deferred tax liability | (27) |
Total net assets acquired | £ 20,675 |
ISDC |  |
Disclosure of detailed information about business combination [line items] |  |
Intangible asset - Client relationships |  | £ 4,301
Property, plant and equipment |  | 323
Trade and other receivables |  | 1,739
Cash and cash equivalents |  | 768
Trade and other payables |  | (648)
Other taxation and social security |  | (430)
Corporation tax payable |  | (17)
Borrowings |  | (196)
Other liabilities |  | (103)
Deferred tax liability |  | (1,075)
Total net assets acquired |  | £ 4,662

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