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Leases - Amounts recognized in the consolidated balance sheet (Details) - GBP (£)
 6 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Leases        
Right-of-use assets £ 3,747,000 £ 4,383,000 £ 3,930,000  
Additions to right-of-use assets 235,000 1,522,000    
Lease liabilities:        
Current 763,000 1,257,000 568,000  
Non-current 2,994,000 3,083,000 3,255,000  
Total lease liabilities 3,757,000 4,340,000 3,823,000 £ 4,393,000
Property        
Leases        
Right-of-use assets 3,328,000 4,004,000 3,590,000  
Plant and machinery        
Leases        
Right-of-use assets £ 419,000 £ 379,000 £ 340,000