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Leases - Amounts recognized in the consolidated balance sheet (Details) - GBP (£)
 6 Months Ended 12 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Leases        
Right-of-use assets £ 3,353,000 £ 4,072,000 £ 3,747,000  
Additions to right-of-use assets 301,000 1,428,000    
Lease liabilities:        
Current 804,000 1,561,000 763,000  
Non-current 2,475,000 2,869,000 2,994,000  
Total lease liabilities 3,279,000 4,430,000 3,757,000 £ 4,340,000
Property        
Leases        
Right-of-use assets 2,925,000 3,655,000 3,328,000  
Plant and machinery        
Leases        
Right-of-use assets £ 428,000 £ 417,000 £ 419,000