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Deferred tax - Analysis of the deferred tax (Details) - GBP (£)
£ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Analysis of deferred tax      
Deferred tax assets £ (58,415) £ (63,332) [1] £ (141,485) [1]
Deferred tax labilities 31,865 29,134 [1] 21,536 [1]
Net deferred tax asset (26,550) (34,198) (119,949)
US      
Analysis of deferred tax      
Deferred tax assets (58,415) (63,332)  
Net deferred tax asset (58,415) (63,332) (141,485)
UK      
Analysis of deferred tax      
Deferred tax labilities 31,865 29,134  
Net deferred tax asset £ 31,865 £ 29,134 £ 21,536
[1] Comparative amounts have been restated—see note 33 for further details.