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Intangible assets - Reconciliation of intangible assets (Details) - GBP (£)
£ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of intangible assets        
Opening net book amount     £ 812,382 £ 743,278
Additions     217,436 222,171
Disposals     (9,951) (8,810)
Amortization charge £ (50,495) £ (44,971) (97,340) (85,110)
Closing net book amount 922,527 871,529 922,527 871,529
Cost / gross value        
Reconciliation of intangible assets        
Opening net book amount     1,368,446 1,219,466
Closing net book amount 1,472,518 1,409,586 1,472,518 1,409,586
Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening net book amount     (556,064) (476,188)
Closing net book amount (549,991) (538,057) (549,991) (538,057)
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     384,885 316,211
Additions     215,086 221,472
Disposals     (9,951) (8,810)
Amortization charge     (95,863) (83,736)
Closing net book amount 494,157 445,137 494,157 445,137
Registrations | Cost / gross value        
Reconciliation of intangible assets        
Opening net book amount     924,829 779,196
Closing net book amount 1,026,551 968,617 1,026,551 968,617
Registrations | Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening net book amount     (539,944) (462,985)
Closing net book amount (532,394) (523,480) (532,394) (523,480)
Other intangible assets        
Reconciliation of intangible assets        
Opening net book amount     6,044 5,614
Additions     2,350 699
Amortization charge     (1,477) (1,374)
Closing net book amount 6,917 4,939 6,917 4,939
Other intangible assets | Cost / gross value        
Reconciliation of intangible assets        
Opening net book amount     22,164 18,817
Closing net book amount 24,514 19,516 24,514 19,516
Other intangible assets | Accumulated depreciation, amortization and impairment        
Reconciliation of intangible assets        
Opening net book amount     (16,120) (13,203)
Closing net book amount £ (17,597) £ (14,577) £ (17,597) £ (14,577)