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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, 2022
Jun. 30, 2021
Movements on the provision for impairment of trade receivables    
Provision at beginning of year £ 4,971 £ 13,150
Increase in provision recognized in profit or loss during the year 2,277 1,054
Unused amount reversed - cash received (93) (188)
Receivables written off during the year as uncollectible (764) (9,003)
Receivables offset against contract liabilities - deferred revenue 5,842 90
Foreign exchange gains/(losses) on retranslation recognized in profit or loss during the year 7 (132)
Provision at end of year £ 12,240 £ 4,971