Hey,
I'm a first year at Birmingham and checked out York St. John whilst I was applying, so can only give you my impressions or I'm afraid! Didn't look at Bradford :/
York seemed like a really nice place...the uni was a little small for me but it depends on what you're after. I don't know what grades you're hoping to get but York we asking for BBC/BCC last year and that was pretty low compared the the AAB/ABB of the Cadiffs and Birminghams etc. But they seemed to be pretty organised and the course looked good so I don't think you can really go wrong! Probably not much of a help but ah well!
Where else have you applied?
Good Luck!