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Inventories (Details) - GBP (£)
6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Inventories      
Finished goods £ 2,792,000 £ 2,535,000 £ 2,186,000
Cost of inventory recognized during the period £ 3,211,000 £ 4,888,000 £ 6,433,000