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Property, plant and equipment (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Reconciliation of changes in property, plant and equipment      
Opening amount £ 256,118,000 £ 253,282,000  
Additions 51,892,000 17,834,000  
Depreciation charge (15,676,000) (14,998,000) £ (11,876,000)
Closing amount 292,334,000 256,118,000 253,282,000
Net book amount of property, plant and equipment pledged as security 211,132,000 212,148,000  
Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 414,641,000 409,992,000  
Closing amount 459,589,000 414,641,000 409,992,000
Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (158,523,000) (156,710,000)  
Closing amount (167,255,000) (158,523,000) (156,710,000)
Freehold property      
Reconciliation of changes in property, plant and equipment      
Opening amount 220,033,000 220,736,000  
Additions   2,786,000  
Depreciation charge (3,479,000) (3,489,000)  
Closing amount 216,554,000 220,033,000 220,736,000
Freehold property | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 289,943,000 287,413,000  
Closing amount 289,943,000 289,943,000 287,413,000
Freehold property | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (69,910,000) (66,677,000)  
Closing amount (73,389,000) (69,910,000) (66,677,000)
Plant and machinery      
Reconciliation of changes in property, plant and equipment      
Opening amount 11,414,000 11,612,000  
Additions 2,649,000 4,784,000  
Depreciation charge (5,427,000) (4,982,000)  
Closing amount 8,636,000 11,414,000 11,612,000
Plant and machinery | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 45,809,000 46,706,000  
Closing amount 43,560,000 45,809,000 46,706,000
Plant and machinery | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (34,395,000) (35,094,000)  
Closing amount (34,924,000) (34,395,000) (35,094,000)
Fixtures and fittings      
Reconciliation of changes in property, plant and equipment      
Opening amount 24,671,000 20,934,000  
Additions 7,236,000 10,264,000  
Depreciation charge (6,770,000) (6,527,000)  
Closing amount 25,137,000 24,671,000 20,934,000
Fixtures and fittings | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 78,889,000 75,873,000  
Closing amount 84,079,000 78,889,000 75,873,000
Fixtures and fittings | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (54,218,000) (54,939,000)  
Closing amount (58,942,000) £ (54,218,000) £ (54,939,000)
Assets under construction      
Reconciliation of changes in property, plant and equipment      
Additions 42,007,000    
Closing amount 42,007,000    
Assets under construction | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Closing amount £ 42,007,000