What paperwork is needed to transfer a visa from an old UK passport to a new one at Jomtien immigration?

To transfer your existing visa and stamps from an old UK passport to a new one at Jomtien Immigration, you will need to provide the following paperwork: your old passport, new passport, a letter from the British embassy, and possibly a change passport form obtained at the office. While some users indicated that copies of passports and stamps might not be required depending on the immigration office, others suggested it could vary, with some offices being stricter than others. It's also advisable to bring some cash for any fees that might be charged for services or copies.