If you can't answer this question why are you applying.In all seriousness even if you said bluntly :"I don't it's just a back up lol"
You may still find yourself with an offer if it is a school who go into clearing every year. They do t really care as long as they get the fees.
You need to look after youown interests and ask yourself if you can see yourself going down this route for a full 4 years of your life!
Believe me the universities won't look after yourself and will even deceive you for there own interests.