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Intangible assets - Reconciliation of intangible assets (Details) - GBP (£)
£ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of intangible assets        
Opening net book amount     £ 768,857 £ 799,640
Additions     104,965 16,332
Disposals     (51,902) (7,929)
Amortization charge £ (31,257) £ (33,440) (63,444) (68,571)
Closing net book amount 758,476 739,472 758,476 739,472
Cost / gross value        
Reconciliation of intangible assets        
Opening net book amount     1,207,745 1,217,426
Closing net book amount 1,207,618 1,198,449 1,207,618 1,198,449
Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening net book amount     (438,888) (417,786)
Closing net book amount (449,142) (458,977) (449,142) (458,977)
Goodwill        
Reconciliation of intangible assets        
Opening net book amount     421,453 421,453
Closing net book amount 421,453 421,453 421,453 421,453
Goodwill | Cost / gross value        
Reconciliation of intangible assets        
Opening net book amount     421,453 421,453
Closing net book amount 421,453 421,453 421,453 421,453
Registrations        
Reconciliation of intangible assets        
Opening net book amount     338,762 369,508
Additions     103,489 14,461
Disposals     (51,902) (7,929)
Amortization charge     (61,172) (66,947)
Closing net book amount 329,177 309,093 329,177 309,093
Registrations | Cost / gross value        
Reconciliation of intangible assets        
Opening net book amount     772,328 785,594
Closing net book amount 772,089 764,746 772,089 764,746
Registrations | Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening net book amount     (433,566) (416,086)
Closing net book amount (442,912) (455,653) (442,912) (455,653)
Other intangible assets        
Reconciliation of intangible assets        
Opening net book amount     8,642 8,679
Additions     1,476 1,871
Amortization charge     (2,272) (1,624)
Closing net book amount 7,846 8,926 7,846 8,926
Other intangible assets | Cost / gross value        
Reconciliation of intangible assets        
Opening net book amount     13,964 10,379
Closing net book amount 14,076 12,250 14,076 12,250
Other intangible assets | Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening net book amount     (5,322) (1,700)
Closing net book amount £ (6,230) £ (3,324) £ (6,230) £ (3,324)