Oxbridge: Combo of self-assured go-getting private schoolers who speak with inordinate eloquence, bright and outgoing state schoolers who were always top of their classes, and insecure studious clever people who wonder how on earth they got there
Exeter: Posh people who aren't particularly exceptional (no hate)
Durham: The obvious one, soz, salty Oxbridge rejects who were in it for the prestige
Warwick: Clearly the best people (no ulterior motive..)
QMUL and Brunel: folks who just wanted to say they'd been to a London uni
Bristol: Clever indie people who decided the London unis and Oxbridge were too mainstream