Recently posted in a teachers forum, third party info. However, I recently attempted to get my criminal record check certified at the U.K. Embassy in Bangkok last month - they point blank refused and said that it needs to be done by a third party in the UK. This wouldn’t be enough for the MFA to certify it anyway, so if this is true it’s an impossible requirement to meet (at least with a UK document anyway).
TLDR : Answer Summary
The discussion centers on the requirements for certifying a UK criminal record check for a Non-B visa in Thailand. Many users express frustration with the UK Embassy in Bangkok, which refuses to certify such documents and insists they must be processed in the UK. This leads to concerns about the impracticality of meeting Thai government requirements, especially in relation to employment in Thai schools. Various commenters share experiences and insights on the steps needed to obtain the proper certifications, including the involvement of third-party certifications in the UK and the Ministry of Foreign Affairs in Thailand.