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Property, plant and equipment (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Reconciliation of changes in property, plant and equipment      
Opening amount £ 242,661,000 £ 247,059,000  
Additions 22,497,000 7,887,000  
Depreciation charge (11,876,000) (12,285,000) £ (12,987,000)
Closing amount 253,282,000 242,661,000 247,059,000
Net book amount of property, plant and equipment pledged as security 214,705,000 209,442,000  
Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 396,333,000 390,824,000  
Closing amount 409,992,000 396,333,000 390,824,000
Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (153,672,000) (143,765,000)  
Closing amount (156,710,000) (153,672,000) (143,765,000)
Property      
Reconciliation of changes in property, plant and equipment      
Opening amount 218,116,000 219,120,000  
Additions 6,046,000 2,390,000  
Depreciation charge (3,426,000) (3,394,000)  
Closing amount 220,736,000 218,116,000 219,120,000
Property | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 281,377,000 278,987,000  
Closing amount 287,413,000 281,377,000 278,987,000
Property | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (63,261,000) (59,867,000)  
Closing amount (66,677,000) (63,261,000) (59,867,000)
Plant and machinery      
Reconciliation of changes in property, plant and equipment      
Opening amount 5,269,000 5,345,000  
Additions 8,921,000 2,706,000  
Transfers   231,000  
Depreciation charge (2,578,000) (3,013,000)  
Closing amount 11,612,000 5,269,000 5,345,000
Plant and machinery | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 39,562,000 38,309,000  
Closing amount 46,706,000 39,562,000 38,309,000
Plant and machinery | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (34,293,000) (32,964,000)  
Closing amount (35,094,000) (34,293,000) (32,964,000)
Fixtures and fittings      
Reconciliation of changes in property, plant and equipment      
Opening amount 19,276,000 22,594,000  
Additions 7,530,000 2,791,000  
Transfers   (231,000)  
Depreciation charge (5,872,000) (5,878,000)  
Closing amount 20,934,000 19,276,000 22,594,000
Fixtures and fittings | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 75,394,000 73,528,000  
Closing amount 75,873,000 75,394,000 73,528,000
Fixtures and fittings | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (56,118,000) (50,934,000)  
Closing amount £ (54,939,000) £ (56,118,000) £ (50,934,000)