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Tax expense - Reconciliation of the total tax expense (Details) - GBP (£)
£ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of the total tax expense        
Profit before tax   £ 26,097 £ 56,538 £ 48,833
Profit before tax multiplied by weighted average US federal corporate income tax rate of 28.0% (2017: 35.0%; 2016: 35.0%)   (7,307) (19,789) (17,092)
Tax effects of:        
Adjustment in respect of previous years   923 69 (124)
Difference in tax rates on non-US operations   491 244 (612)
Foreign exchange gains on US dollar denominated tax basis   238 2,362 5,755
Expenses not deductible for tax purposes   (648) (247) (389)
Impact of change in US federal corporate income tax rate on opening balance   (48,832)    
Re-measurement of unrealized foreign exchange US deferred tax asset   (8,795)    
Re-measurement of foreign tax credit US deferred tax asset   1,637    
One time mandatory US tax charge   (1,074)    
Total tax expense   £ (63,367) £ (17,361) £ (12,462)
US        
Tax effects of:        
Corporate tax rate 21.00% 28.00% 35.00% 35.00%