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Financial risk management - Credit risk (Details) - GBP (£)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Details of credit risk    
Number of days for payment that specific agreements may go beyond 30 days  
Trade receivables £ 123,797,000 £ 76,606,000
Transfer fees receivable 29,214,000 46,343,000
Cost / gross value    
Details of credit risk    
Trade receivables £ 133,505,000 90,719,000
Minimum    
Details of credit risk    
Credit term for other sales 14 days  
Maximum    
Details of credit risk    
Credit term for other sales 30 days  
Neither past due nor impaired    
Details of credit risk    
Trade receivables £ 111,912,000 54,501,000
Past due but not impaired    
Details of credit risk    
Trade receivables 11,885,000 22,104,000
Impaired and fully provided for | Cost / gross value    
Details of credit risk    
Trade receivables 9,708,000 14,113,000
Up to 3 months past due | Past due but not impaired    
Details of credit risk    
Trade receivables 11,462,000 20,670,000
Up to 3 months past due | Impaired and fully provided for | Cost / gross value    
Details of credit risk    
Trade receivables 2,772,000 5,519,000
Over 3 months past due | Past due but not impaired    
Details of credit risk    
Trade receivables 423,000 1,434,000
Over 3 months past due | Impaired and fully provided for | Cost / gross value    
Details of credit risk    
Trade receivables £ 6,936,000 £ 8,594,000