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Significant Accounting Policies (Details)
£ in Thousands
 12 Months Ended
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
GBP (£)
Jun. 30, 2016
GBP (£)
Jul. 06, 2018
Disclosure of detailed information about property, plant and equipment [line items]        
Vesting period 5 years      
Cost of sales £ 145,443 £ 108,760 £ 75,046  
Computers and equipment        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, property plant and equipment 3 years      
Fixtures and fittings        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, property plant and equipment 5 years      
Motor vehicles        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, property plant and equipment 5 years      
Non-compete agreement        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, intangible assets 3 years      
Bottom of range | Client relationship        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, intangible assets 5 years      
Bottom of range | Computer software        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, intangible assets 3 years      
Top of range | Client relationship        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, intangible assets 10 years      
Top of range | Computer software        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, intangible assets 10 years      
Top of range | Licences        
Disclosure of detailed information about property, plant and equipment [line items]        
Useful life, intangible assets 3 years      
Major ordinary share transactions        
Disclosure of detailed information about property, plant and equipment [line items]        
Stock split, conversion ratio       0.20
Contingent consideration        
Disclosure of detailed information about property, plant and equipment [line items]        
Financial liabilities, at fair value £ 11,300