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Provisions for liabilities and charges - Summary of Provisions for Liabilities and Charges (Parenthetical) (Detail) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other provisions [abstract]
Acquisitions provisions from revisions to fair value adjustments	£ 8.4	£ 21.9
Transformation costs with respect to the strategic initiative of co-locations	£ 50.6

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Revisions to fair value adjustments related to acquisition.

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- Definition

Transformation costs with respect to the strategic initiative of co-locations.

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