The Guradian league tables are very suspect due to them priviledging wrongheaded criteria like NSS scores which are useless for comparitive analysis between institutions, so pick a good uni overall, Russel group or above and you should be reasonably safe and aviod the low quality factories of lesser uni's, of which there are many (I know I teach crim at one). Also consider what staff are actually researching/publishing, so look at their online profiles, and see if any of it meshes with your reasons for being interested in the subject. In short, do your homework, visit the campus and place, do online research (look for the skeletons), and speak to peeps who have done the course (and not uni place people, they won't give you the full 9 yards, remember their sales people being employed to say nice things). You only get to do an undergrad degree once, so don't be fooled by all those nice looking and sounding webpages and admin staff, the sausage factories want yer money is all!!