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Intangible assets - Reconciliation of intangible assets (Details) - GBP (£)
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of intangible assets        
Opening amount     £ 799,640,000 £ 717,544,000
Additions     16,332,000 128,765,000
Disposals     (7,929,000) (2,844,000)
Amortization charge £ (33,440,000) £ (37,335,000) (68,571,000) (73,389,000)
Closing amount 739,472,000 770,076,000 739,472,000 770,076,000
Cost / gross value        
Reconciliation of intangible assets        
Opening amount     1,217,426,000 1,073,505,000
Closing amount 1,198,449,000 1,160,851,000 1,198,449,000 1,160,851,000
Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening amount     (417,786,000) (355,961,000)
Closing amount (458,977,000) (390,775,000) (458,977,000) (390,775,000)
Goodwill        
Reconciliation of intangible assets        
Opening amount     421,453,000 421,453,000
Closing amount 421,453,000 421,453,000 421,453,000 421,453,000
Goodwill | Cost / gross value        
Reconciliation of intangible assets        
Opening amount     421,453,000 421,453,000
Closing amount 421,453,000 421,453,000 421,453,000 421,453,000
Registrations        
Reconciliation of intangible assets        
Opening amount     369,508,000 290,520,000
Additions     14,461,000 126,912,000
Disposals     (7,929,000) (2,844,000)
Amortization charge     (66,947,000) (72,756,000)
Closing amount 309,093,000 341,832,000 309,093,000 341,832,000
Registrations | Cost / gross value        
Reconciliation of intangible assets        
Opening amount     785,594,000 645,433,000
Closing amount 764,746,000 730,926,000 764,746,000 730,926,000
Registrations | Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening amount     (416,086,000) (354,913,000)
Closing amount (455,653,000) (389,094,000) (455,653,000) (389,094,000)
Other intangible assets        
Reconciliation of intangible assets        
Opening amount     8,679,000 5,571,000
Additions     1,871,000 1,853,000
Amortization charge     (1,624,000) (633,000)
Closing amount 8,926,000 6,791,000 8,926,000 6,791,000
Other intangible assets | Cost / gross value        
Reconciliation of intangible assets        
Opening amount     10,379,000 6,619,000
Closing amount 12,250,000 8,472,000 12,250,000 8,472,000
Other intangible assets | Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening amount     (1,700,000) (1,048,000)
Closing amount £ (3,324,000) £ (1,681,000) £ (3,324,000) £ (1,681,000)