Just reviving this thread - I'm one of the Access Officers for Sidney Sussex College.
If anyone has any questions about applying to Cambridge or Sidney, feel free to ask.
I'll check TSR on Friday evening every week, and so will reply to things then.
Also - just posting this for now, not sure what the best way to spread the word about applying to oxbridge is on here.... will probably make a thread detailing what I am and what I do.