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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, 2020
Jun. 30, 2019
Movements on the provision for impairment of trade receivables    
Provision at beginning of year £ 12,954 £ 9,708
(Decrease)/increase in provision recognized in profit or loss during the year (1,185) 985
Unused amount reversed - cash received (5,125)  
Receivables written off during the year as uncollectible (3,076) (279)
Receivables offset against contract liabilities - deferred revenue 9,530 2,517
Foreign exchange gains on retranslation recognized in profit or loss during the year 52 23
Provision at end of year £ 13,150 £ 12,954