In a month my shop (Reptile Cymru) will be open in Cardiff, if that helps.. probably not Dragon Reptiles is the only other shop I know of in Cardiff (keeps mouth shut), there's Krazy Kritters in Barry, there's also a small shop in Cwmbran but I can't remember the name of it.
Wildside I think is the most well known one in Newport but don't know address details, should be able to find it online somewhere. I know there's a few other small ones but I don't think they have any online details.
I won't go into details but I would not trust Norwich Reptile co. as far as I could throw them. I know too many people, me included, who have had countless bad experiences with them. Reptile Crazy are better, but bairly. the only shop in norfolk I would buy animals from would be Swallow Aquatics. they are exspensive, but for the most part they know what they are doing, and are honest about what they are selling. other than that I would go via friends and breeders.