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Income tax expense - Current tax and Deferred tax (Details) - GBP (£)
£ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Current tax:            
Total current tax expense £ (6,310) £ (2,245) £ (7,360) £ (3,006)    
Deferred tax:            
Origination and reversal of temporary differences (6,432) (8,633) (6,783) (9,974)    
Re-measurement of US deferred tax asset (3,996)   (3,996)      
Total deferred tax expense (10,428) (8,633) (10,779) (9,974)   £ (8,112)
Total tax expense            
Total income tax expense (16,738) (10,878) (18,139) (12,980)    
Corporate tax rate           28.20%
Forecast            
Total tax expense            
Corporate tax rate         32.58%  
UK and US            
Current tax:            
Current tax on profit for the period (6,073) (1,953) (6,673) (2,603)    
Adjustment in respect of previous years (32)   (32)      
Other than UK and US            
Current tax:            
Current tax on profit for the period £ (205) £ (292) £ (655) £ (403)