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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, 2021
Jun. 30, 2021
Dec. 31, 2020
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period £ (140,926) £ (151,219) £ (190,333)
Recognized in revenue during the period 75,882 74,272 82,929
Cash received/amounts invoiced during the period (115,497) (63,979) (43,815)
Contract liabilities - deferred revenue at end of period (180,541) (140,926) (151,219)
Current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract assets - accrued revenue at beginning of period 40,544 65,795 45,966
Recognized in revenue during the period 66,055 37,563 64,354
Cash received/amounts invoiced during the period (36,771) (62,328) (44,525)
Loss allowance   (486)  
Contract assets - accrued revenue at end of period 69,828 40,544 65,795
Contract liabilities - deferred revenue at beginning of period (117,984) (137,447) (171,574)
Recognized in revenue during the period 75,882 74,272 82,929
Cash received/amounts invoiced during the period (115,497) (63,979) (43,815)
Reclassified to current during the period 1,668 9,170 (4,987)
Contract liabilities - deferred revenue at end of period (155,931) (117,984) (137,447)
Non-current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period (22,942) (13,772) (18,759)
Reclassified to current during the period (1,668) (9,170) 4,987
Contract liabilities - deferred revenue at end of period £ (24,610) £ (22,942) £ (13,772)