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Deferred revenue (Details) - GBP (£)
£ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Deferred revenue        
Total £ 162,614 £ 217,597 [1] £ 149,546 [1]  
Less non-current deferred revenue (32,952) (37,085) (32,704) £ (39,648)
Current deferred revenue £ 129,662 £ 180,512 [1] £ 116,842 [1] £ 203,445 [1]
[1] Comparative amounts have been restated - see note 34 to the interim consolidated financial statements for further details.