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IncomeTax expense - Reconciliation of the total tax expense (Details) - GBP (£)
£ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 21, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Reconciliation of the total tax expense          
Profit before tax     £ 27,476 £ 25,833 [1] £ 56,588 [1]
Profit before tax multiplied by weighted average US federal corporate income tax rate of 21.0% (2018: 28.0%; 2017: 35.0%)     (5,770) (7,233) (19,806)
Tax effects of:          
Adjustment in respect of previous years     1,085 923 69
Difference in tax rates on non-US operations     63 491 244
Foreign exchange gains on US dollar denominated tax basis     1,311 238 2,362
Expenses not deductible for tax purposes     (3,093) (695) (248)
Impact of change in US federal corporate income tax rate on opening balance       (48,954)  
Re-measurement of unrealized foreign exchange US deferred tax asset       (8,795)  
Re-measurement of foreign tax credit US deferred tax asset     (2,191) 1,637  
One time mandatory US tax charge       (1,074)  
Total tax expense     £ (8,595) £ (63,462) [1] £ (17,379) [1]
US          
Tax effects of:          
Corporate tax rate 21.00% 35.00% 21.00% 28.00% 35.00%
[1] Comparative amounts have been restated—see note 33 for further details.