$ million	1H21	1H20	Change	Constant currency change
Revenue	1,216	1,132	7%	7%
Core revenue	1,216	1,132	7%	7%
Gross profit	616	577	7%	7%
Core gross profit	616	577	7%	7%
Operating profit	326	297	10%	15%
Core operating profit	309	284	9%	15%
EBITDA	358	328	9%	14%
Core EBITDA	358	328	9%	14%
Profit attributable to shareholders	248	212	17%	26%
Core profit attributable to shareholders	223	205	9%	18%
Basic earnings per share (cents)	107.4	87.6	23%	32%
Core basic earnings per share (cents)	96.5	85.3	13%	23%
Interim dividend per share (cents)	18.0	16.0	13%	-
Cash flow from operating activities	224	292	(23)%	-