I have a UK passport with less than 6 months validity. I have two questions. Can I get a 30 day extension on a tourist visa? And, as it's a double entry visa, could I get a further extension if required? Thanks.

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Yes you can get a 30 day extension at mmigration., TM 7 form and 1900 baht. To activate the second entry, you must exit Thailand, enter another country and then re-enter. Unfortunately the neighboring countries require at least six months to enter so you will have a problem, Thailand does not but you must enter another country. It's been reported that the closest place that you can go with less than 6 months left is Hong Kong. You can not get a further extension beyond 30 days unless it is for medical reasons or you have a Thai family.

You can get a 30 day extension from Immigration.

With 6 month validity you would not be able to enter another Country and return to activate your second entry.