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Revenue from contracts with customers - Assets and liabilities related to contracts with customers (Details) - GBP (£)
£ in Thousands
 6 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period £ (182,544) £ (180,541) £ (140,926)
Recognized in revenue during the period 132,606 31,072 75,882
Cash received/amounts invoiced during the period (117,890) (33,075) (115,497)
Contract liabilities - deferred revenue at end of period (167,828) (182,544) (180,541)
Current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract assets - accrued revenue at beginning of period 36,239 69,828 40,544
Recognized in revenue during the period 64,230 33,567 66,055
Cash received/amounts invoiced during the period (46,964) (67,156) (36,771)
Contract assets - accrued revenue at end of period 53,505 36,239 69,828
Contract liabilities - deferred revenue at beginning of period (165,847) (155,931) (117,984)
Recognized in revenue during the period 132,606 31,072 75,882
Cash received/amounts invoiced during the period (117,890) (33,075) (115,497)
Reclassified during the period (9,423) (7,913) 1,668
Contract liabilities - deferred revenue at end of period (160,554) (165,847) (155,931)
Non-current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period (16,697) (24,610) (22,942)
Reclassified during the period 9,423 7,913 (1,668)
Contract liabilities - deferred revenue at end of period £ (7,274) £ (16,697) £ (24,610)