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Acquisition of Subsidiaries - Goodwill (Details) - GBP (£) £ in Thousands	Jun. 30, 2018	Dec. 29, 2017	Jun. 30, 2017	Sep. 02, 2016
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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The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

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