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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, 2019
Jun. 30, 2019
Dec. 31, 2018
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period £ (223,500) £ (162,614) £ (217,597)
Recognized in revenue during the period 125,635 128,956 112,215
Cash received/amounts invoiced during the period (69,317) (189,842) (57,232)
Contract liabilities - deferred revenue at end of period (167,182) (223,500) (162,614)
Current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract assets - accrued revenue at beginning of period 39,532 79,496 38,018
Recognized in revenue during the period 74,877 37,778 74,034
Cash received/amounts invoiced during the period (36,311) (77,742) (32,556)
Contract assets - accrued revenue at end of period 78,098 39,532 79,496
Contract liabilities - deferred revenue at beginning of period (190,146) (129,662) (180,512)
Recognized in revenue during the period 125,635 128,956 112,215
Cash received/amounts invoiced during the period (69,317) (168,025) (56,519)
Reclassified to current during the period (9,749) (21,415) (4,846)
Contract liabilities - deferred revenue at end of period (143,577) (190,146) (129,662)
Non-current contract assets and contract liabilities      
Revenue from contracts with customers      
Contract liabilities - deferred revenue at beginning of period (33,354) (32,952) (37,085)
Cash received/amounts invoiced during the period   (21,817) (713)
Reclassified to current during the period 9,749 21,415 4,846
Contract liabilities - deferred revenue at end of period £ (23,605) £ (33,354) £ (32,952)