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Share capital - American Depositary Shares (Details)	Dec. 31, 2017 £ / shares	Dec. 31, 2016 American_Depositary_Shares £ / shares	Dec. 31, 2015 £ / shares
Disclosure of classes of share capital [line items]
Number of American Depositary Shares outstanding | American_Depositary_Shares		25,180,726
Par value per share (in GBP per share)	£ 0.50	£ 0.5	£ 0.5
Ordinary shares
Disclosure of classes of share capital [line items]
Par value per share (in GBP per share)	£ 0.50	£ 0.50

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard
-URIDate 2017-03-09

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- Definition

Number Of American Depositary Shares Outstanding

+ References

No definition available.

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