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Borrowings - Net debt (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Net debt reconciliation    
Net debt at beginning of the period £ 213,087 £ 260,898
Net debt cash flow adjustment 31,337 (69,662)
Net debt non-cash adjustment 9,322 21,851
Net debt at end of the period 253,746 213,087
Non-current borrowings    
Net debt reconciliation    
Net debt at beginning of the period 497,630 484,528
Net debt non-cash adjustment (10,936) 13,102
Net debt at end of the period 486,694 497,630
Current borrowings    
Net debt reconciliation    
Net debt at beginning of the period 5,724 5,564
Net debt cash flow adjustment (17,083) (16,660)
Net debt non-cash adjustment 20,433 16,820
Net debt at end of the period 9,074 5,724
Cash and cash equivalents    
Net debt reconciliation    
Net debt at beginning of the period (290,267) (229,194)
Net debt cash flow adjustment 48,420 (53,002)
Net debt non-cash adjustment (175) (8,071)
Net debt at end of the period £ (242,022) £ (290,267)