I have just received a new UK passport and am currently on a standard one month visa on arrival (which is stamped in my old passport). Do I need to transfer this visa to a new passport before leaving the country or can I just take both passports on a visa run and get the new visa stamped in the new passport? Thanks in advance.
TLDR : Answer Summary
The user inquired about the necessity of transferring their 30-day visa exempt entry stamp (in their old UK passport) to their new UK passport before leaving Thailand. Comments indicate that it is generally acceptable to present both passports at exit. However, it is also advised to consider transferring the entry stamp to the new passport if seeking an extension or a new tourist visa from Laos.