Business Combinations - Schedule of Cash Flow on Acquisitions (Detail) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about business combination [line items]
Net cash outflow	£ (5)	£ (11)	£ (15)
Business combinations [member]
Disclosure of detailed information about business combination [line items]
Deferred payments for prior year acquisitions and other items	(5)	(11)	(7)
Cash - current year acquisitions			(7)
Acquisition costs and other acquisition liabilities paid			(1)
Net cash outflow	£ (5)	£ (11)	£ (15)

The amount of acquisition-related costs for transactions recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
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The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The portion of consideration paid or received, consisting of cash and cash equivalents, in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]; Cash and cash equivalents; Consideration paid (received)]

+ References

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