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Cash flow information - Net debt (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about borrowings    
Net debt at beginning of the period £ 253,746 £ 213,087
Net debt cash flow adjustment (78,339) 31,337
Net debt non-cash adjustment 28,188 9,322
Net debt at end of the period 203,595 253,746
Non-current borrowings    
Disclosure of detailed information about borrowings    
Net debt at beginning of the period 486,694 497,630
Net debt non-cash adjustment 19,085 (10,936)
Net debt at end of the period 505,779 486,694
Current borrowings    
Disclosure of detailed information about borrowings    
Net debt at beginning of the period 9,074 5,724
Net debt cash flow adjustment (21,973) (17,083)
Net debt non-cash adjustment 18,352 20,433
Net debt at end of the period 5,453 9,074
Cash and cash equivalents    
Disclosure of detailed information about borrowings    
Net debt at beginning of the period (242,022) (290,267)
Net debt cash flow adjustment (56,366) 48,420
Net debt non-cash adjustment (9,249) (175)
Net debt at end of the period £ (307,637) £ (242,022)