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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, 2020
Jun. 30, 2020
Dec. 31, 2019
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period £ (190,333) £ (167,182) £ (223,500)
Recognized in revenue during the period 82,929 99,527 125,635
Cash received/amounts invoiced during the period (43,815) (122,678) (69,317)
Contract liabilities - deferred revenue at end of period (151,219) (190,333) (167,182)
Current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract assets - accrued revenue at beginning of period 45,966 78,098 39,532
Recognized in revenue during the period 64,354 44,249 74,877
Cash received/amounts invoiced during the period (44,525) (76,381) (36,311)
Contract assets - accrued revenue at end of period 65,795 45,966 78,098
Contract liabilities - deferred revenue at beginning of period (171,574) (143,577) (190,146)
Recognized in revenue during the period 82,929 99,527 125,635
Cash received/amounts invoiced during the period (43,815) (122,678) (69,317)
Reclassified to current during the period (4,987) (4,846) (9,749)
Contract liabilities - deferred revenue at end of period (137,447) (171,574) (143,577)
Non-current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period (18,759) (23,605) (33,354)
Reclassified to current during the period 4,987 4,846 9,749
Contract liabilities - deferred revenue at end of period £ (13,772) £ (18,759) £ (23,605)