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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, 2023
Jun. 30, 2022
Movements on the provision for impairment of trade receivables    
Provision at beginning of year £ 12,240 £ 4,971
(Decrease)/increase in provision recognized in profit or loss during the year (72) 2,277
Unused amount reversed - cash received (535) (93)
Receivables written off during the year as uncollectible (127) (764)
Receivables offset against contract liabilities - deferred revenue 4,724 5,842
Foreign exchange gains on retranslation recognized in profit or loss during the year 29 7
Provision at end of year £ 16,259 £ 12,240