We've got a Chinese supermarket not too far away but I go to the Wing Yip in Manchester whenever I can - its amazing - and I've also been to the one in Brum. If you ever get the chance to go in person then they're well worth a visit.
My nearest would I suppose be the Cricklewood one or the one near my aunt in Purley but she always moans about Purley (although I know she does go to Purley for shopping) but whenever I suggest going to Purley she claims it is too far (she lives in South Croydon!!!) , too busy and she does not like going there.
Of course there are plenty other places near me I was just googling and found the site and thought it might be of interest to anyone intersted in oriental cuisine - especially those without any decent shops near them.