ahhh no stress for you people....i did my PS and ucas form really late. This is beacuse I made the mistake of thinking my PS was actually good, and so didnt show it to my referee until 5 days before the cambridge deadline. He told me to throw it in the bin, it was rubbish. So I effectively did the entire application in 5 days - it's do-able, but I dont recommend it. But dont stress yourselves now, you have plenty of time. At least you've already decided which college to apply to!