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Intangible assets - Other intangible assets (Details) - GBP (£)
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Intangible assets        
Intangible assets and goodwill £ 922,527,000 £ 812,382,000 £ 871,529,000 £ 743,278,000
Cost / gross value        
Intangible assets        
Intangible assets and goodwill 1,472,518,000 1,368,446,000 1,409,586,000 1,219,466,000
Accumulated depreciation, amortization and impairment        
Intangible assets        
Intangible assets and goodwill (549,991,000) (556,064,000) (538,057,000) (476,188,000)
Other intangible assets        
Intangible assets        
Intangible assets and goodwill 6,917,000 6,044,000 4,939,000 5,614,000
Other intangible assets | Cost / gross value        
Intangible assets        
Intangible assets and goodwill 24,514,000 22,164,000 19,516,000 18,817,000
Other intangible assets | Cost / gross value | Internally generated        
Intangible assets        
Intangible assets and goodwill 2,103,000   2,103,000  
Other intangible assets | Accumulated depreciation, amortization and impairment        
Intangible assets        
Intangible assets and goodwill (17,597,000) £ (16,120,000) (14,577,000) £ (13,203,000)
Other intangible assets | Accumulated depreciation, amortization and impairment | Internally generated        
Intangible assets        
Intangible assets and goodwill £ (2,103,000)   £ (2,101,000)