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Property, plant and equipment (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of changes in property, plant and equipment      
Opening amount £ 244,738,000 £ 245,714,000  
Additions 11,311,000 9,173,000  
Disposals (23,000) (43,000)  
Depreciation charge (10,625,000) (10,106,000) £ (9,967,000)
Closing amount 245,401,000 244,738,000 245,714,000
Net book amount of property, plant and equipment pledged as security 205,388,000 199,990,000  
Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 354,083,000 349,906,000  
Closing amount 361,957,000 354,083,000 349,906,000
Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (109,345,000) (104,192,000)  
Closing amount (116,556,000) (109,345,000) (104,192,000)
Freehold property      
Reconciliation of changes in property, plant and equipment      
Opening amount 222,628,000 225,926,000  
Additions   3,000  
Disposals (5,000)    
Depreciation charge (3,288,000) (3,301,000)  
Closing amount 219,335,000 222,628,000 225,926,000
Freehold property | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 269,372,000 269,369,000  
Closing amount 269,367,000 269,372,000 269,369,000
Freehold property | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (46,744,000) (43,443,000)  
Closing amount (50,032,000) (46,744,000) (43,443,000)
Plant and machinery      
Reconciliation of changes in property, plant and equipment      
Opening amount 3,385,000 4,241,000  
Additions 2,605,000 1,578,000  
Disposals   (7,000)  
Depreciation charge (1,821,000) (2,427,000)  
Closing amount 4,169,000 3,385,000 4,241,000
Plant and machinery | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 34,475,000 36,728,000  
Closing amount 34,790,000 34,475,000 36,728,000
Plant and machinery | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (31,090,000) (32,487,000)  
Closing amount (30,621,000) (31,090,000) (32,487,000)
Fixtures and fittings      
Reconciliation of changes in property, plant and equipment      
Opening amount 18,725,000 15,547,000  
Additions 8,706,000 7,592,000  
Disposals (18,000) (36,000)  
Depreciation charge (5,516,000) (4,378,000)  
Closing amount 21,897,000 18,725,000 15,547,000
Fixtures and fittings | Cost / gross value      
Reconciliation of changes in property, plant and equipment      
Opening amount 50,236,000 43,809,000  
Closing amount 57,800,000 50,236,000 43,809,000
Fixtures and fittings | Accumulated depreciation, amortization and impairment      
Reconciliation of changes in property, plant and equipment      
Opening amount (31,511,000) (28,262,000)  
Closing amount £ (35,903,000) £ (31,511,000) £ (28,262,000)