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Provisions for liabilities and charges - Summary of Provisions for Liabilities and Charges (Parenthetical) (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of other provisions [abstract] |  |
Acquisitions provisions from revisions to fair value adjustments | £ 0.7 | £ 8.4
Transformation costs with respect to the strategic initiative of co-locations |  | £ 50.6

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- Definition Revisions to fair value adjustments related to acquisition. + References No definition available. + Details
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- Definition Transformation costs with respect to the strategic initiative of co-locations. + References No definition available. + Details
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