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Authorised and issued share capital - Range of Exercise Prices of Options (Detail) - 12 months ended Dec. 31, 2019 | USD ($) | £ / shares
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Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Weighted average contractual life (Months) | 90 months |
American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Weighted average contractual life (Months) | 89 months |
Bottom of range [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Exercise price | £ / shares |  | £ 6.268
Bottom of range [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Exercise price | $ | $ 49.230 |
Top of range [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Exercise price | £ / shares |  | 17.055
Top of range [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Exercise price | $ | 115.940 |
Weighted average [member] | Ordinary shares [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Exercise price | £ / shares |  | £ 12.171
Weighted average [member] | American depository receipts [member] |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |
Exercise price | $ | $ 83.488 |

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- Definition The exercise price of outstanding share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The exercise price of outstanding ADR options. + References No definition available. + Details
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