What do I need to open a Thai bank account for my retirement visa?

The user is heading to Thailand to obtain a retirement visa and is inquiring whether KTB Bank requires an affirmation letter from the British consulate to open a bank account. Community responses highlight that generally, banks require a 90-day NON-O visa for account openings and emphasize the importance of a Residence Certificate from immigration. Users recommend using Kasikorn Bank for its expat-friendly services, and some share experiences that contradict the need for a consulate letter.