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Tax expense - Current tax and Deferred tax (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Current tax:      
Total current tax credit/(expense) £ 58 £ (24,476) £ (8,388)
Deferred tax:      
Total deferred tax (expense)/credit (63,425) 7,115  
Total tax expense      
Total tax expense (63,367) (17,361) (12,462)
UK and US      
Current tax:      
Current tax on (loss)/profit for the year (1,809) (19,722) (4,633)
Adjustment in respect of previous years 2,590 (2,651) (2,476)
Deferred tax:      
Total deferred tax (expense)/credit (63,425) 7,115 (4,074)
US      
Deferred tax:      
Origination and reversal of temporary differences (9,225) (3,371) (3,879)
Adjustment in respect of previous years (1,909) 1,782 5,039
Impact of change in corporate tax rate (48,832)    
Total deferred tax (expense)/credit (59,966) (1,589) 1,160
UK      
Deferred tax:      
Origination and reversal of temporary differences (3,701) 6,171 (5,258)
Adjustment in respect of previous years 242 938 (2,687)
Impact of change in corporate tax rate   1,595 2,711
Total deferred tax (expense)/credit (3,459) 8,704 (5,234)
Other than UK and US      
Current tax:      
Current tax on (loss)/profit for the year £ (723) £ (2,103) £ (1,279)