Here's the general requirement and form for transferring stamps from an old passport to a new one.

/Transfer-Stamp-to-New-Passport-Form.pdf

If you're a UK or AUS passport holder, you can enter with a 60-day visa exemption and receive a free stamp on arrival.

Just make sure he has your full address in Thailand. He’ll need it to complete the TDAC arrival card and in case Immigration asks, which they rarely do.

The processing time stated on the website is 10 business days; however, this is merely an estimate. You may wish to wait a little longer and contact them if you have not yet received any update by email.

@Greg **********

Hehe, just save that one for when the question comes up again — it was a very clear, informative, and well-written comment.😉

You can do it online, or just go with him to immigration and bring your house book and ID card to sort it out in person.

@Greg **********

Good and clear comment, but he still wanted a Non-O visa based on marriage to a Thai national. He just got a bit unsure about the financial requirements and thought it required both income and a lump sum.

@Stuart *****

great 👍

@Tom *******

It’s just your friend Stuart who’s got things a bit mixed up and is talking about an extension of stay in Thailand.

You can apply for a Non-O, as you’re trying to do, by providing documentation of at least three months of income of a minimum of 40,000 baht per month.

400,000 baht is just an alternative basis for applying if you’re not using income.

@Stuart *****

He’s not applying for a Non O visa inside Thailand and can apply for a Non O e-visa through the Thai embassy of London only with three months income.