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Loans and Borrowings Summary of Loans and Borrowings (Details) - GBP (£)
£ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings £ 19,764 £ 29,465
Current borrowings and current portion of non-current borrowings 19,744 29,402
Non-current portion of other non-current borrowings 20 63
Revolving credit facility    
Disclosure of detailed information about borrowings [line items]    
Borrowings 19,700 29,288
Current borrowings and current portion of non-current borrowings 19,700 29,288
Non-current portion of other non-current borrowings £ 0 0
Revolving credit facility | LIBOR / EURIBOR | Bottom of range    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 0.80%  
Revolving credit facility | LIBOR / EURIBOR | Top of range    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 1.40%  
Technology loan    
Disclosure of detailed information about borrowings [line items]    
Borrowings £ 0 26
Borrowings, interest rate 8.00%  
Current borrowings and current portion of non-current borrowings £ 0 26
Non-current portion of other non-current borrowings 0 0
Finance lease    
Disclosure of detailed information about borrowings [line items]    
Borrowings 64 151
Current borrowings and current portion of non-current borrowings 44 88
Non-current portion of other non-current borrowings £ 20 £ 63
Finance lease | Bottom of range    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 3.50%  
Finance lease | Top of range    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 10.00%