What are my options for obtaining a Thai tourist visa with only one free page in my UK passport?

Air Asia has flights from CNX to KUL (non-stop).

Scoot and Silk Air have non-stops from CNX to SIN.

The process is the same. Fly down, transit desk and fly back. Never enter the 2nd country so no wasted space in the passport.

you did see that they're in Chiang Mai right?

Agree with Tod Mae Sai / Takchilik 4 small stamps in out. Nice day out....enjoy..

Will you not have a problem trying to extend the 30 day exemption while you're waiting for your new passport? - Don't you have to send the old passport along?

Worth checking - if so, recommend tourist visa application in Malaysia so that you get 60 days.

You could get a 10 USD note in pristine condition for the burma border (otherwise it's 500Baht) to stamp in&out.

Other than that, nope, just you and your passport.

Do a quick flight to KUL or SIN.

You don't even need to enter the 2nd country.

Just go down on a flight, go through the transit gate and return on the next flight.

Then do your Thai visa.

It's not a visa, it's a visa exempt stamp you get coming back. So that are no documents or applications or photos involved (other than the arrival card which you get and fill out there). Do remember you only get max two land border visa exempt entries into Thailand per calendar year.

You don't need anything. Just your passport. And $10 or 500B for the Myanmar side, for the border pass/stamp. Note $10 is less than 500B.

Thai and Myanmar immigration are helpful at that checkpoint, you can ask them to squeeze in the stamps because you want to save your blank pages and they will.

The process is simple and straightforward, I just don't know about the stamps :(

You can get a bus from CM to the border pretty easily at the bus station in Chiang Mai. They drop you off pretty close to the border, it's been so long though that I forget if you can walk it need to get another form of transportation to the border. If you do it's only a few minutes from the bus station. On the Thai side they'll stamp you out of Thailand, and once in Myanmar they'll do whatever they do. When you cross into Myanmar they'll keep your passport at the border and you can either go into Tacheliek and have a washer around the market or just go straight back to Thailand. Thailand will give you another stamp (if you are eligible*) for 30 days visa exempt and you're done! Back in Thailand with a 30 day reprieve. For this there's no need to visit embassies out do anything beforehand. Show up at the border, leave Thailand (even if only for the time it takes to get stamped in and out of Myanmar) and come back with 30 more days.

I've heard and read about buses from Chiang Mai to the border that aren't from the bus station? Maybe "green bus" or something like that. Do some googling and see if that's what you're looking for.

Wish I had definite answers for all of your questions.

If you're OK with just 30 days you can definitely do it, if you NEED the 60 day tourist visa I don't see any ways to get that without a risk of running out of room.

Anyone know what happens if that does occur?

Malaysia and Singapore are both options for a border bounce with very little space used. Neither is bussable from CM. Maybe someone with recent experience at Mae Sai will chime in with the Myanmar stamp situation?

I'm not sure what goes in your passport for those border crossings, I haven't done one in years. But my experience asking immigration officers to conserve space and put stamps where I want them ended at a South African immigration checkpoint when the office sternly told me he'd put the stamp where he pleases. It's just not something I'm pushy about and don't think that's a good way to engage. If you can get it and back on just stamps on a single page that's probably your best bet. Get your 30 days and then apply for a new book from your embassy