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Authorised and issued share capital - Range of Exercise Prices of Options (Detail)	Dec. 31, 2018 USD ($) Months	Dec. 31, 2018 GBP (£) Months
Ordinary shares [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Weighted average contractual life | Months	96	96
American depository receipts [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Weighted average contractual life | Months	93	93
Bottom of range [member] | Ordinary shares [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Exercise price | £		£ 5.483
Bottom of range [member] | American depository receipts [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Exercise price | $	$ 44.560
Top of range [member] | Ordinary shares [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Exercise price | £		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 | £		£ 12.656
Weighted average [member] | American depository receipts [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Exercise price | $	$ 87.703

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+ References

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The exercise price of outstanding share options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
-Paragraph 45
-Subparagraph d
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-URIDate 2018-03-16

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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 2018-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard
-URIDate 2018-03-16

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The exercise price of outstanding ADR options.

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