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Share-based Payments - Summary of Share Options and Weighted Average Exercise Prices (Parenthetical) (Details) - GBP (£) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract] |  |
Weighted average share price for share options at date of exercise | £ 10.43 | £ 9.00
Vesting period of share options exercised | 4 years |

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- Definition The weighted average share price at the date of exercise for share options that are exercised in a share-based payment arrangement. [Refer: Share-based payment arrangements [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Vesting period of share options exercised. + References No definition available. + Details
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