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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, 2021
Jun. 30, 2020
Movements on the provision for impairment of trade receivables    
Provision at beginning of year £ 13,150 £ 12,954
Increase/(decrease) in provision recognized in profit or loss during the year 1,054 (1,185)
Unused amount reversed - cash received (188) (5,125)
Receivables written off during the year as uncollectible (9,003) (3,076)
Receivables offset against contract liabilities - deferred revenue 90 9,530
Foreign exchange gains on retranslation recognized in profit or loss during the year (132) 52
Provision at end of year £ 4,971 £ 13,150