You want university league tables, availabe in The Times newspaper, and usually kept at most good libraries and careers services. Look at which are good, order some prospectuses (free, and usually just a case of entering your address in the uni site online), then make sure you get to the open days of the ones you're interested in before you put down your application.
It sounds like a lot of work, and the actual open days are (the rest isn't), but if you think about it, it's where you're going to be spending at least 3-4years of your life, with THE main qualification for shaping your career, so invest the time, it's worth it.