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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, 2024
Jun. 30, 2023
Movements on the provision for impairment of trade receivables    
Provision at beginning of year £ 16,259 £ 12,240
Increase/ (decrease) in provision recognized in profit or loss during the year 387 (72)
Unused amount reversed - cash received (111) (535)
Receivables written off during the year as uncollectible (12,228) (127)
Receivables offset against contract liabilities - deferred revenue 6,665 4,724
Foreign exchange gains on retranslation recognized in profit or loss during the year 13 29
Provision at end of year £ 10,985 £ 16,259