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Tax expense - Current tax and Deferred tax (Details) - GBP (£)
£ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 21, 2017
Jun. 30, 2019
Jun. 30, 2018
Current tax:                
Total current tax (expense)/credit   £ (2,245) £ 411 [1] £ (3,006) £ 269 [1]      
Deferred tax:                
Origination and reversal of temporary differences   (8,633) (9,122) [1] (9,974) (16,535) [1]      
Adjustment in respect of previous years     155   155      
Impact of change in US federal corporate income tax rate [1]     (48,954)   (48,954)      
Total deferred tax expense   (8,633) (57,921) [1] (9,974) (65,334) [1]     £ (63,519) [1]
Total tax expense                
Total tax expense   (10,878) (57,510) [1] (12,980) (65,065) [1]      
Corporate tax rate               30.90%
Forecast                
Total tax expense                
Corporate tax rate             28.20%  
UK and US                
Current tax:                
Current tax on profit for the period   (1,953) (688) [1] (2,603) (688) [1]      
Adjustment in respect of previous years     1,128   1,128      
US                
Total tax expense                
Corporate tax rate 21.00%         35.00%    
Other than UK and US                
Current tax:                
Current tax on profit for the period   £ (292) £ (29) [1] £ (403) £ (171) [1]      
[1] Comparative amounts have been restated - see note 34 to the interim consolidated financial statements for further details.