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Intangible assets - Other intangible assets (Details) - GBP (£)
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Intangible assets        
Intangible assets and goodwill £ 758,476,000 £ 768,857,000 £ 739,472,000 £ 799,640,000
Cost / gross value        
Intangible assets        
Intangible assets and goodwill 1,207,618,000 1,207,745,000 1,198,449,000 1,217,426,000
Accumulated depreciation, amortization and impairment        
Intangible assets        
Intangible assets and goodwill (449,142,000) (438,888,000) (458,977,000) (417,786,000)
Other intangible assets        
Intangible assets        
Intangible assets and goodwill 7,846,000 8,642,000 8,926,000 8,679,000
Other intangible assets | Cost / gross value        
Intangible assets        
Intangible assets and goodwill 14,076,000 13,964,000 12,250,000 10,379,000
Other intangible assets | Cost / gross value | Internally generated        
Intangible assets        
Intangible assets and goodwill 2,076,000   1,559,000  
Other intangible assets | Accumulated depreciation, amortization and impairment        
Intangible assets        
Intangible assets and goodwill (6,230,000) £ (5,322,000) (3,324,000) £ (1,700,000)
Other intangible assets | Accumulated depreciation, amortization and impairment | Internally generated        
Intangible assets        
Intangible assets and goodwill £ (1,065,000)   £ (275,000)