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Trade and other receivables - Additional Information (Detail) - GBP (£) £ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Trade and other receivables [abstract]
Bad debt expense recognised on trade accounts receivables	£ 21.8	£ 8.3	£ 19.0

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No definition available.

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- Definition

Provision for bad debt expense.

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No definition available.

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