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Acquisitions - Additional Information (Detail) - GBP (£) £ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about business combination [abstract]
Goodwill that is expected to be deductible for tax purposes	£ 65.3	£ 63.9

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
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- Definition

The amount of goodwill in a business combination that is expected to be deductible for tax purposes. [Refer: Goodwill; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2019-01-01
-Paragraph B64
-Subparagraph k
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_k&doctype=Appendix&subtype=B
-URIDate 2019-03-27

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Period Type:	instant