I posted this on another forum and someone couldn't see why this was aggressive bar the car mirror bit. They said it was normal for London filtering. Yes, people do like to crack on, and there's no point hanging about, but if the dozy buggers haven't seen you to move over, so what? They're not obliged to. Keep your opinion inside your helmet if you can't civilly get them to cooperate. While not all of it was blatantly being a dick, there were enough clues to give an idea of the manner of the guy.