If my tourist E Visa doesn't arrive before my departure from the UK, I will enter visa exempt for 30 days and extend for another 30 days. If the visa arrives whilst I am in Thailand, could I then do a border run and use the unused tourist visa for another 60 days? I am staying very near a so called " friendly" border post.
TLDR : Answer Summary
The user plans to enter Thailand on a visa exemption for 30 days and extend their stay for another 30 days if their tourist E Visa does not arrive before departure. They ask if an unused E Visa can be activated via a border run if it arrives while they are in Thailand. Commenters confirm it's possible to exit Thailand and re-enter to use the E Visa, which is valid for 3 months from issuance.