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Inventories (Details) - GBP (£)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Inventories      
Finished goods £ 2,186,000 £ 2,130,000  
Cost of inventory recognized during the period 6,433,000 8,664,000 £ 8,450,000
Write down of inventories 133,000 22,000 0
Reversal of previous inventory write-down £ 22,000 £ 0 £ 4,000