Is it crucial I apply via UCAS for second year entry?

I sent my ucas off with my 5 choices for second year entry, but unfortunately one of them when I contacted them gave me a mixed picture on the prospect of applying and now it turns out I can't go into second year at that place. And since I've passed the seven day deadline I can't change it for another uni :L

I'm asking if it is possible for me to apply directly to a university instead of having to do it through ucas for this point of entry, as I understand it is different as to applying at university from year one.

Plus I got an offer from one university before I even sent a ucas application to them..so it's making me wonder..

thanks