Where are you planning on doing this first? As I'd recommend an alternate route. I was looking at Durham uni, and Ian from the Foundation Centre said they had nearly 1000 applicants last year, but only took on 14.
The Alternate Route is doing the OpenPlus programme were you spend the first year studying Open University, and progressing straight into your second year at a Red Brick Uni. I've chosen Lancaster, as the Physics department and Accomodation quality are by far some of the best Britain have to offer.