Getting off the point, but my friend had a supervisor who sexually harrassed/assaulted so many of his female students that he was eventually banned from closing the door during teaching, but you know...that was all. Heaven forfend he should take his "brains" elsewhere.
I don't agree missmiss that working class students are not prepared for Oxbridge. Many of the best students I knew had come from state schools and quite poor backgrounds (e.g. got help every term from the hardship funds).
But I agree that the atmosphere of Oxbridge (as a consequence of the "bias in the system" and the history) does not lend itself to making working class students feel coomfortable. Or rather, if you attend a vair posh public/private school, you will find a second home in the atmosphere of Oxford/Cambridge.
Regardless though, I would always be ready to belief that there is discrimination in individual tutors' minds when they make choices. Not so much out and out racism, but the "oh look someone who looks/sounds like me, pin a badge on him" thing Helena Kennedy described.