You need to apply for a change of visa status, for a Non-Immigrant Visa "business visa" Category “B”,at the Royal Thai Embassies or Royal Thai Consulates-General.You are therefore recommended to consult with the Immigration Office and the Department of Employment accordingly.
In order to work or setting up a business in Thailand, there are 2 important elements:
(1) Non-Immigrant “B” Visa and (2) Work Permit.
or if you are not busy just visit visa2britain office located at pattaya beach road
soi.13-13/1.behind right spot bar..surely,you can find more information and good advice about your business plan.
cheers