$ million	2018	2017	Change	Constant currency change
Revenue	2,070	1,936	+7%	+8%
Core revenue	2,076	1,936	+7%	+8%
Gross profit	1,050	967	+9%	+10%
Core gross profit	1,072	973	+10%	+12%
Operating profit/(loss)	371	(747)	N/A	N/A
Core operating profit	460	386	+19%	+24%
EBITDA	492	488	+1%	+5%
Core EBITDA	549	468	+17%	+21%
Profit/(loss) attributable to shareholders	282	(843)	N/A	N/A
Core profit attributable to shareholders	332	252	+32%	+39%
Basic earnings/(loss) per share (cents)	117.0	(351.3)	N/A	N/A
Core basic earnings per share (cents)	137.8	105.0	+31%	+38%
Dividend per share (cents)	38.0	34.0	+12%	-
Net cash flow from operating activities	430	443	(3)%	-