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Deferred tax - Analysis of the deferred tax (Details) - GBP (£)
£ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Analysis of deferred tax        
Deferred tax assets £ (61,786) £ (58,362) £ (53,862)  
Deferred tax liabilities 30,851 31,337 37,766  
Net deferred tax asset (30,935) (27,025) (16,096) £ (26,550)
US        
Analysis of deferred tax        
Deferred tax assets (61,786) (58,362) (53,862)  
UK        
Analysis of deferred tax        
Deferred tax liabilities £ 30,851 £ 31,337 £ 37,766