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Leases - Amounts recognized in the consolidated balance sheet (Details) - GBP (£)
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Leases      
Right-of-use assets £ 3,930,000 £ 4,559,000 £ 5,168,000
Additions to right-of-use assets 219,000 239,000  
Lease liabilities:      
Current 568,000 1,067,000 1,622,000
Non-current 3,255,000 3,326,000 3,626,000
Total lease liabilities 3,823,000 4,393,000 5,248,000
Property      
Leases      
Right-of-use assets 3,590,000 4,290,000 5,056,000
Plant and machinery      
Leases      
Right-of-use assets £ 340,000 £ 269,000 £ 112,000