Noted. My passport doesn't expire, it's just nearly full. So I'll try and time getting a new one to coincide with doing my 90 day and Extension renewal at the same time in the new passport.
Great. So I could do my 90 day as normal in July, then get the new passport, then go to Immigration in mid-Oct and renew my Extension and do the next 90 day in the new passport.
Thanks. Can I wait until the Extension is due to be renewed and then just get the new one in the new passport (thus avoiding an additional trip out to Immigration for the transfer)?
Yeah, there's only one flight a day and not every day of the week. I use it a lot as my wife's family live in Pakse. I hate long bus journeys, so if I ever had to get a visa from Savannakhet I think I'd use it.
You can fly to Savannakhet from BKK on Lao Airlines. It used to be a direct flight (about 1 hour) but now it goes via Pakse, so takes a bit longer. Not cheap, but quick and easy.
She is supposed to go in person. I went once to get permits for my wife and kid, and got referred to a manager with whom I pleaded. She was stern, but relented and I got the permits. Best that she goes if you want to avoid hassle, or get it at the airport.
Then I'd wait until you come to Thailand, then get his Thai and UK passports while you're here. Both are quite straightforward to do here. You'll need YOUR long-form birth certificate to get him a UK passport, so bring it with you to Thailand. Good luck.