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Deferred tax - Analysis of the deferred tax (Details) - GBP (£)
£ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Analysis of deferred tax        
Deferred tax assets £ (53,862) £ (58,415) £ (57,636)  
Deferred tax liabilities 37,766 31,865 33,302  
Net deferred tax asset (16,096) (26,550) (24,334) £ (34,198)
US        
Analysis of deferred tax        
Deferred tax assets (53,862) (58,415) (57,636)  
UK        
Analysis of deferred tax        
Deferred tax liabilities £ 37,766 £ 31,865 £ 33,302