Given how little these guys do for the people of their countries, I couldn't give a frig less whether the "leaders" of the world are having tea together or not.
If anything, the "leaders" are plotting against the regular people, so I'd just as soon they didn't trust one another to begin with.
We need new leaders, asap. So it doesn't worry me as to whether Cameron will "like" Trump. Cameron can fuck off, IMO.