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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