When we're in Swansea visiting my family, Ning sometimes does some shopping at a small Chinese corner-shop on the corner of Oxford street and Beach Road, not far from Joe's Ice-cream shop.- Hung Cheong Stores. It's not a big shop but usually have most of the Thai veg and other sauces etc. she needs. Only problem is that it's hard to find a parking spot near to it.
She also uses the larger Asian (Pakistani/Bangladeshi) stores nearby on St Helen's Road they have a good selection of Asian vegetables and sell Thai Jasmine rice at a reasonable price.