Hello! I entered Thailand on a single entry 60 day tourist visa that I got in Hong Kong, my country of residence, prior to arriving. I entered on 14 March and my visa expires around mid May. I will be heading to South Africa on 6 May for a week and would like to come back to Thailand. Am I able to come back on the visa exemption program (UK passport)? Is it for 30 days?
TLDR : Answer Summary
You can return to Thailand on the visa exemption program for 30 days after your trip to South Africa, provided you meet the entry requirements. Your initial tourist visa will expire before you return, but as a UK passport holder, you should be able to re-enter without issues.