Aha, blimey! Now Imperial really know how to impress. (I think they were the first to go down as a choice on UCAS, and since, the hope for an offer has only increased
).
Cambridge's science fair days or what have you tend to be pretty darn interesting, and the trek moving from college to college is fun.
They even had a Harry Potter magic style event at one college - rightly so since Oxbridge = closest thing to Hogwarts.
Good luck! You shall be starting medical school a year from now hopefully (unless you want to take a gap year - in that case, 2 years from now). Where are you thinking of applying?
My friend's mother had a word with his Physics teacher. Things are looking better as far as predicted grades go for him.