My nan is looking for a puppy. She wants a Welsh pembroke corgi, preferably a bitch. I can't seem to find one over the internet, so if you know of a breeder or are one yourself, please contact me... Many thanks

Have you tried doing a search on Champdogs?

otherwise try here

http://www.the-welsh-corgi-club.co.uk/index_main_page.htm

http://www.pembrokewelshcorgileague.co.uk/

Please be careful of anyone contacting you, good breeders rarely have to advertise or resort to trawling the internet ;)  The links above should be able to put you in touch with responsible caring breeders.  Be aware though that you may have to wait for a puppy from a good breeder but the care that they take over their pups makes it worthwhile.  Make sure that the pup is KC registered (DLRC is not the same ;) ) and that the breeder asks you loads of questions as they should be concerned about where the pup goes ;)
KC registration should be part of the price of the pup and not cost extra.  KC registered pups are not usually more expensive than otherwise registered pups either :)