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Intangible assets - Other intangible assets (Details) - GBP (£)
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Intangible assets        
Intangible assets and goodwill £ 777,473,000 £ 775,170,000 £ 758,476,000 £ 768,857,000
Cost / gross value        
Intangible assets        
Intangible assets and goodwill 1,303,033,000 1,267,525,000 1,207,618,000 1,207,745,000
Accumulated depreciation, amortization and impairment        
Intangible assets        
Intangible assets and goodwill (525,560,000) (492,355,000) (449,142,000) (438,888,000)
Other intangible assets        
Intangible assets        
Intangible assets and goodwill 5,668,000 6,845,000 7,846,000 8,642,000
Other intangible assets | Cost / gross value        
Intangible assets        
Intangible assets and goodwill 15,561,000 14,797,000 14,076,000 13,964,000
Other intangible assets | Cost / gross value | Internally generated        
Intangible assets        
Intangible assets and goodwill 2,098,000   2,076,000  
Other intangible assets | Accumulated depreciation, amortization and impairment        
Intangible assets        
Intangible assets and goodwill (9,893,000) £ (7,952,000) (6,230,000) £ (5,322,000)
Other intangible assets | Accumulated depreciation, amortization and impairment | Internally generated        
Intangible assets        
Intangible assets and goodwill £ (1,667,000)   £ (1,065,000)