For the mod/Northern soul contingent of Cardiff's support, check this band out -
http://www.themoons.co.ukSaw them by chance in London a couple of weeks ago. They have some links with Paul Weller I think (1 or more of them part of his backing band?). Got given a promo couple of their new album, out next month, which is very, very 60s, but very well produced, with some cracking songs on it. Definitely recommend seeing them.