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Cash flow information - Net debt (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of detailed information about borrowings    
Net debt at beginning of the year £ 474,076 £ 203,595
Net debt cash flows (19,655) 243,185
Net debt other movement (34,843) 27,296
Net debt at end of the year 419,578 474,076
Non-current borrowings    
Disclosure of detailed information about borrowings    
Net debt at beginning of the year 520,010 505,779
Net debt cash flows (625) (555)
Net debt other movement (54,336) 14,786
Net debt at end of the year 465,049 520,010
Current borrowings    
Disclosure of detailed information about borrowings    
Net debt at beginning of the year 5,605 5,453
Net debt cash flows 42,321 (19,325)
Net debt other movement 17,261 19,477
Net debt at end of the year 65,187 5,605
Cash and cash equivalents    
Disclosure of detailed information about borrowings    
Net debt at beginning of the year (51,539) (307,637)
Net debt cash flows (61,351) 263,065
Net debt other movement 2,232 (6,967)
Net debt at end of the year £ (110,658) £ (51,539)