True it's still only early September.
With Cambridge, you might as well. If you get in, you can reject you know! It shouldn't matter what your school would think..they don't matter as you'll be off to Uni anyway. That really shouldn't stop you. However if you don't think it's the place for you, don't bother. Then again, if you got in, would you go? If there's a possibility you might, go for it. But God don't feel forced into going there just because of what school/people would think. They really don't matter - you're leaving it all in less than a year anyway.
I'm not sure - haven't researched myself. I didn't get the last bit sorry - my mind's a bit slow today. How will people still be at Uni? Ehhhhhhhhh don't most people have 3 year courses? Doubts? God I need to wake up.
True, the London thing put me off and the fact that it's a very small Uni did too. People would still have fun I think, but 5000 students or so, including postgrad, is far too small for me. I'd rather do a postgrad degree there. Depends though - some people may prefer the smaller Uni and the fact that it's all Arts and Humanities subjects devoted to Africa and Asia.