My new UK passport is due to arrive any day now. However I need to leave the country as my multi non o visa based on marriage 90 days are up this Sunday. The non o visa itself runs out next year.

If it doesn't arrive today or tomorrow what are my options?

Will I lose my non o visa?

Can I use an emergency UK passport

Take you wife with you to immigration and apply for a 60 day extension to visit her.

You will need your marriage certificate plus a copy, copies of your wife's house book registry and ID card. And 1900 baht to pay the fee.

If you are not living where wife's house book is for you will be asked for proof of residence at most offices also.

Thanks Ubonjoe for your reply you are a legend. Even though it is a multi entry non o I can do this? Be fantastic if I can. Thanks in advance.

You can do it with any type of entry. You are extending your permit to stay not your visa. There are people that are extending all their 90 day entries from the non-o visa for 60 days instead of doing a border run for a new entry.