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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, 2023
Jun. 30, 2023
Dec. 31, 2022
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period £ (176,283) £ (167,828) £ (182,544)
Recognized in revenue during the period 134,384 141,292 132,606
Cash received/amounts invoiced during the period (115,803) (149,747) (117,890)
Contract liabilities - deferred revenue at end of period (157,702) (176,283) (167,828)
Current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract assets - accrued revenue at beginning of period 43,332 53,505 36,239
Recognized in revenue during the period 105,882 38,818 64,230
Cash received/amounts invoiced during the period (87,395) (48,991) (46,964)
Contract assets - accrued revenue at end of period 61,819 43,332 53,505
Contract liabilities - deferred revenue at beginning of period (169,624) (160,554) (165,847)
Recognized in revenue during the period 134,384 141,292 132,606
Cash received/amounts invoiced during the period (115,803) (149,747) (117,890)
Reclassified during the period 1,400 (615) (9,423)
Contract liabilities - deferred revenue at end of period (149,643) (169,624) (160,554)
Non-current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period (6,659) (7,274) (16,697)
Reclassified during the period (1,400) 615 9,423
Contract liabilities - deferred revenue at end of period £ (8,059) £ (6,659) £ (7,274)