You can still have chemistry on screen without getting on with the person. But it just makes your job a lot easier if you don't have to gird your loins, if that's not quite the right phrase, every time you're going to do a scene with that person.
“Francis Webb is easily our greatest poet and one of the greatest poets in the world but he's hardly ever mentioned.”
“I pride myself in taking care of my mind, body and soul, and not just through exercise.”