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Investment properties (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Investment property      
Opening amount £ 20,273,000 £ 20,553,000  
Depreciation charge (280,000) (280,000) £ (274,000)
Closing amount 19,993,000 20,273,000 20,553,000
Rental revenue 2,215,000 2,240,000  
Direct operating (credits)/expenses from properties, all of which generated rental revenue £ (23,000) 294,000  
Useful lives of investment property (in years) 50 years    
Cost / gross value      
Investment property      
Opening amount £ 32,193,000 32,193,000  
Closing amount 32,193,000 32,193,000 32,193,000
Accumulated depreciation, amortization and impairment      
Investment property      
Opening amount (11,920,000) (11,640,000)  
Closing amount (12,200,000) (11,920,000) £ (11,640,000)
Not measured at fair value in statement of financial position but for which fair value is disclosed      
Investment property      
Opening amount 38,250,000    
Closing amount £ 32,970,000 £ 38,250,000