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Inventories (Details) - GBP (£)
6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Inventories      
Finished goods £ 2,535,000 £ 2,610,000 £ 2,130,000
Cost of inventory recognized during the period £ 4,888,000 £ 4,769,000 £ 8,664,000