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Acquisition of Subsidiaries - Pro-Forma Information (Details) - GBP (£)
£ in Thousands
 6 Months Ended 10 Months Ended 12 Months Ended
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