How can I apply for a new British passport without going to Bangkok while living in Isaan, and how do I transfer valid extensions to the new passport?

Applying for a new British passport while residing in Isaan can be done through various agents who handle the process without requiring a trip to Bangkok. It’s advisable to apply for the passport about 9 months before the current one expires, as the processing can take 3-11 weeks. Once the new passport is obtained, you will need to visit the Immigration office to transfer any valid visa extensions from the old passport to the new one. Several community members recommend various agents in the region, emphasizing that hiring an agent can be more cost-effective than traveling to Bangkok.