Hoo Hing have branches in Leyton, Brimsdown/Enfield (Mollison Ave just the other side of the Resevoirs) & Chadwell Heath
See Woo have a great store just the other side of the Blackwall Tunnel in Charlton
Wing Yip Superstore, Cricklewood, just of the A406
Loon Fung have a great store in the old Mall in Stratford. Westfield, plaus some Asian food shopping after. What more would a Thai girl want.
New Loon Moon Supermarket in Soho is always popular and a must do bolt on to days out up town.
Loads of stores / asian shops all over East London sell a variety of Thai foods, particularly vegetables not seen in the big supermarkets.