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Trade and other receivables - Summary of Trade and Other Receivables, Amounts Falling Due After More Than One Year (Detail) - GBP (£)
£ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Trade and other non-current receivables [abstract]      
Prepayments £ 4.2 £ 3.6 £ 4.3
Accrued income 21.8 20.5 21.9
Fair value of derivatives   2.1 12.2
Other debtors 144.4 150.0 175.9
Trade and other receivables £ 170.4 £ 176.2 [1] £ 214.3 [1]
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.