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Leases - Amounts recognized in the consolidated balance sheet (Details) - GBP (£)
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Leases      
Right-of-use assets £ 7,145,000 £ 8,195,000  
Additions to right-of-use assets 81,000 749,000  
Lease liabilities:      
Current 572,000 934,000  
Non-current 7,899,000 7,707,000  
Total lease liabilities 8,471,000 8,641,000 £ 8,880,000
Property      
Leases      
Right-of-use assets 6,879,000 7,740,000  
Plant and machinery      
Leases      
Right-of-use assets £ 266,000 £ 455,000