In my experience BMW drivers live up to the stereotype and Audi drivers are rapidly joining them
I find that Audis are the new BMW and (new) Minis are the new Nissan Micra (But they're BMWs anyway)
It's quite reassuring that people who posted on this thread have problems with the same types of drivers as me - notably Addison Lee minicabs and 4x4 drivers - removing the feeling that I was beginning to imagine things.
The really scary thing, though, is that these types of drivers all manage to make me fear for my life, despite the fact that I commute by car. (Wish I worked nearer to work, so I could commute more often, but 26 miles each way is just not practical)