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Intangible assets - Other intangible assets (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Intangible assets      
Intangible assets and goodwill £ 775,170,000 £ 768,857,000 £ 799,640,000
Cost / gross value      
Intangible assets      
Intangible assets and goodwill 1,267,525,000 1,207,745,000 1,217,426,000
Accumulated depreciation, amortization and impairment      
Intangible assets      
Intangible assets and goodwill (492,355,000) (438,888,000) (417,786,000)
Registrations      
Intangible assets      
Intangible assets and goodwill £ 346,872,000 £ 338,762,000 369,508,000
Useful life of assets beyond one year after current year 4 years 4 years  
Registrations | Less than 1 year      
Intangible assets      
Intangible assets and goodwill £ 119,700,000 £ 124,600,000  
Registrations | Cost / gross value      
Intangible assets      
Intangible assets and goodwill 831,275,000 772,328,000 785,594,000
Registrations | Accumulated depreciation, amortization and impairment      
Intangible assets      
Intangible assets and goodwill (484,403,000) (433,566,000) (416,086,000)
Other intangible assets      
Intangible assets      
Intangible assets and goodwill 6,845,000 8,642,000 8,679,000
Other intangible assets | Cost / gross value      
Intangible assets      
Intangible assets and goodwill 14,797,000 13,964,000 10,379,000
Other intangible assets | Cost / gross value | Internally generated      
Intangible assets      
Intangible assets and goodwill 2,098,000 1,979,000  
Other intangible assets | Accumulated depreciation, amortization and impairment      
Intangible assets      
Intangible assets and goodwill (7,952,000) (5,322,000) £ (1,700,000)
Other intangible assets | Accumulated depreciation, amortization and impairment | Internally generated      
Intangible assets      
Intangible assets and goodwill £ (1,316,000) £ (667,000)