Net finance costs (Tables)

12 Months Ended

Dec. 31, 2017

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Schedule of Information About Finance Income and Costs

All figures in £ millions	Notes		2017			2016			2015
Interest payable				(99	)		(74	)		(61	)
Net foreign exchange losses				—			(21	)		(36	)
Finance costs associated with transactions				(6	)		—			—
Derivatives not in a hedge relationship				(5	)		(2	)		(3	)
Finance costs				(110	)		(97	)		(100	)
Interest receivable				20			15			15
Net finance income in respect of retirement benefits		25		3			11			4
Net foreign exchange gains				44			1			43
Derivatives not in a hedge relationship				12			10			9
Derivatives in a hedge relationship				1			—			—
Finance income				80			37			71
Net finance costs				(30	)		(60	)		(29	)