I used this office, they had people that spoke 6 or 7 languages, and their prixces are reasonable, then again, what price is love worth?? http://thailawoffice.com Scandanavian Law Office in Jom Tien, Pattaya. They have affiliates in a few other major cities in the Kingdom. For my piece of mind it was worth the 12,000 baht I paid for my will, it is ironclad.
SCB told me directly, Banks fall under different 'rules' - a will doesn't automatically grant someone ownership of your account, you need to make them a co-owner, as @Jim Grant sugests, its better to make the party a C0-Signitaory on the account. We will do that on our next trip back to Thailand.
I only did it when a Aussie owned bar I used to frequent owner died, he didn't have a will, his mia noi (???) came out of the woodwork with a video of him saying (rather drunkingly) that he would leave her something when he died..........she got control of the bar from a judge..........bar went belly up because no one would frequent it after that, but you get my drift.
Peace