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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, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Current tax            
Total current tax expense £ (5,712) £ (6,310) £ (9,584) £ (7,360)    
Deferred tax            
Origination and reversal of temporary differences 9,262 (6,432) 13,249 (6,783)    
Re-measurement of US deferred tax asset (7,893) (3,996) (11,203) (3,996)    
Total deferred tax credit/(expense) 1,369 (10,428) 2,046 (10,779)   £ (1,426)
Total tax expense            
Total income tax expense (4,343) (16,738) (7,538) (18,139)    
Corporate tax rate           32.58%
One off items which are not reflected in estimated weighted average annual tax rate     4,800 400    
Forecast            
Total tax expense            
Corporate tax rate         6.58%  
UK and US            
Current tax            
Current tax on loss/(profit) for the period (5,485) (6,073) (8,021) (6,673)    
Adjustment in respect of previous years (562) (32) (562) (32)    
Other than UK and US            
Current tax            
Current tax on loss/(profit) for the period £ 335 £ (205) £ (1,001) £ (655)