Key financial data

$ 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)% -