$ million	H1 2020	H1 2019	Change	Constant currency change
Revenue	1,132	1,047	8%	8%
Core revenue	1,132	1,043	9%	9%
Gross profit	602	548	10%	10%
Core gross profit	602	544	11%	10%
Operating profit	297	238	25%	26%
Core operating profit	284	246	15%	16%
EBITDA	328	297	10%	11%
Core EBITDA	328	288	14%	15%
Profit attributable to shareholders	212	185	15%	16%
Core profit attributable to shareholders	205	176	16%	18%
Basic earnings per share (cents)	87.6	76.4	15%	16%
Core basic earnings per share (cents)	85.3	72.7	17%	18%
Interim dividend per share (cents)	16.0	14.0	14%	-
Cash flow from operating activities	292	187	56%	-