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Dividends (Details) |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 05, 2019 $ / shares | Jan. 04, 2019 USD ($) $ / shares | Jan. 04, 2019 GBP (£) | Dec. 31, 2018 GBP (£) | Jun. 30, 2018 GBP (£) | Dec. 31, 2017 GBP (£)
Disclosure of classes of share capital |  |  |  |  |  |
Dividends paid | £ |  |  |  | £ 0 | £ 21,982,000 | £ 0
Dividends paid before financial statements authorised for issue but not recognised as distribution to owners |  | $ 14,807,000 | £ 11,610,000 |  |  |
Dividends paid before financial statements authorised for issue but not recognised as distribution to owners per share |  | $ 0.09 |  |  |  |
Forecast |  |  |  |  |  |
Disclosure of classes of share capital |  |  |  |  |  |
Dividends paid per share | $ 0.09 |  |  |  |  |

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- Definition The amount of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_107&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_137_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 10 -IssueDate 2018-01-01 -Paragraph 13 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=10&date=2018-03-01&anchor=para_13&doctype=Standard -URIDate 2018-03-16 + Details
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