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Financial risk management - Movements on provision for impairment (Details) - Trade receivables - Accumulated impairment - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Movements on the provision for impairment of trade receivables    
Provision at beginning of period £ 9,708 £ 14,113
Increase in provision recognized in profit or loss during the year 985 160
Receivables written off during the year as uncollectible (279) (6,943)
Receivables offset against contract liabilities - deferred revenue 2,517 2,591
Foreign exchange losses/(gains) on retranslation recognized in profit or loss during the year 23 (213)
Provision at end of period £ 12,954 £ 9,708