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Leases - Amounts recognized in the consolidated balance sheet (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Leases      
Right-of-use assets £ 8,760,000 £ 4,072,000  
Additions to right-of-use assets 6,384,000 1,428,000  
Lease liabilities:      
Current 1,036,000 1,561,000  
Non-current 7,844,000 2,869,000  
Total lease liabilities 8,880,000 4,430,000 £ 4,340,000
Property      
Leases      
Right-of-use assets 8,114,000 3,655,000  
Plant and machinery      
Leases      
Right-of-use assets £ 646,000 £ 417,000