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Revenue from contracts with customers - Assets and liabilities related to contracts with customers (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Revenue from contracts with customers    
Contract liabilities - deferred revenue at beginning of year £ (182,544) £ (140,926)
Recognized in revenue during the year 170,593 108,001
Cash received/amounts invoiced during the year (164,332) (149,619)
Contract liabilities - deferred revenue at end of year (176,283) (182,544)
Current contract assets and contract liabilities    
Revenue from contracts with customers    
Contract assets - accrued revenue at beginning of year 36,239 40,544
Recognized in revenue during the year 53,840 34,948
Cash received/amounts invoiced during the year (46,747) (39,253)
Contract assets - accrued revenue at end of year 43,332 36,239
Contract liabilities - deferred revenue at beginning of year (165,847) (117,984)
Recognized in revenue during the year 170,593 108,001
Cash received/amounts invoiced during the year (164,332) (149,619)
Reclassified during the year (10,038) (6,245)
Contract liabilities - deferred revenue at end of year (169,624) (165,847)
Non-current contract assets and contract liabilities    
Revenue from contracts with customers    
Contract liabilities - deferred revenue at beginning of year (16,697) (22,942)
Reclassified during the year 10,038 6,245
Contract liabilities - deferred revenue at end of year £ (6,659) £ (16,697)