Sheffield has an excellent philosophy department. As I mentioned, I work mainly in epistemology, and there are several epistemologists in Sheffield. It is particularly suited to those who find themselves working in virtue epistemology, or epistemology approached from a normative perspective. I also have interests in the philosophy of mathematics, in particular set theory, indispensability arguments and knowledge of arithmetic (and I am especially interested in how these latter two problems interface). So, listening to Bob Hale lecture has been immensely beneficial. Here are some of the people working in epistemology.
Christopher Hookway works on virtue epistemology, skepticism, and of course American pragmatism.
David Owens works on several different aspects in epistemology. Perhaps his work can best be described as picking up on themes from 17th/18th century philosophy and applying them to current trends in epistemology and has written a book on the 'problem of epistemic normativity' which attempts to address some of these themes.
Robert Stern, who is well-known for his work on Hegel and Kant, also works on skepticism, transcendental arguments in particular.
Paul Faulkner works on trust, testimony and social epistemology, among other things.
Of course other philosophers in Sheffield work on epistemology, however, I think these may be considered the core group. To see other areas of strength at Sheffield consult Leiter's Philosophical Gourmet Report; you might also want to check out the most recent RAE results, where Sheffield Philosophy did very well indeed.
There are about 17 philosophers working in Sheffield, so I can't link to all of them; hopefully you'll research it yourself (and maybe join us here near 'Pride and Prejudice' country.)
And here are some departments close to Sheffield: Leeds, York, Nottingham, Manchester, and Birmingham.