Does anyone know if it's possible for a child born in the UK with a Thai mother and British father to get Thai citizenship. My son is 12 years old and there could be lots of advantages for him in the future with both Thai and British passports.

yes, he is allowed dual nationality. Contact the Thai Embassy in London if you still reside in the UK & set up an appointment & get the list of information/documents they will require or if you are in Thailand contact the local passport office for the same.

If he was born in the UK, it needs to be the embassy in London.

(The passport office in Thailand won't accept a UK birth certificate, so you need one issued by the embassy which will have the child's ID number on it. But you can apply for the passport at the embassy as well.)

After that, you'd want to make sure the child gets onto a Tabien Baan, so that when they're older, they can apply for a "replacement" for the "lost" ID card. (Which was actually never issued because the child was born outside Thailand.)

One thing to be careful of with a boy is that he might be eligible for National Service if he comes to live in Thailand before he's 30.

If he was born in the UK, it needs to be the embassy in London.

(The passport office in Thailand won't accept a UK birth certificate, so you need one issued by the embassy which will have the child's ID number on it. But you can apply for the passport at the embassy as well.)

After that, you'd want to make sure the child gets onto a Tabien Baan, so that when they're older, they can apply for a "replacement" for the "lost" ID card. (Which was actually never issued because the child was born outside Thailand.)

One thing to be careful of with a boy is that he might be eligible for National Service if he comes to live in Thailand before he's 30.

Sorry dont know what happened there it didnt print my reply

Anyway, I have just had a similar problem with my little boy and Immigration Police here in Kan phoned BKK and they said no problem except you have to get birth certificate translated and signed in Thai by the UK Embassy. Hope that helps

Palusa