I think it depends on wether your school cash in your AS level or not, my school didn't, so all I put on my UCAS form were my predicted grades, and I dont think the uni are allowed to ask what you got at AS, and i suppose if they do you can allways say you got an A as they have no way of finding out. Not that I think you should lie.
But really, if you get an interview, then I think it just comes down to how your interviews go, they will be able to tell from them if they want you or not.