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Financial risk management - Credit risk (Details) - GBP (£)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Details of credit risk    
Number of days for payment that specific agreements may go beyond 30 days  
Trade receivables £ 33,740,000 £ 123,797,000
Transfer fees receivable £ 18,270,000 29,214,000
Percentage of provision for trade receivables that are past due and impaired 100.00%  
Minimum    
Details of credit risk    
Credit term for other sales 14 days  
Maximum    
Details of credit risk    
Credit term for other sales 30 days  
Cost / gross value    
Details of credit risk    
Trade receivables £ 46,694,000 133,505,000
Trade receivables | Cost / gross value    
Details of credit risk    
Financial assets 46,694,000 133,505,000
Trade receivables | Cost / gross value | Neither past due nor impaired    
Details of credit risk    
Financial assets 29,437,000 111,912,000
Trade receivables | Cost / gross value | Past due, not impaired    
Details of credit risk    
Financial assets 4,303,000 11,885,000
Trade receivables | Cost / gross value | Past due, fully impaired    
Details of credit risk    
Financial assets £ 12,954,000 £ 9,708,000