Can I use a single re-entry permit if I transit through Bangkok on my way to the UK before returning to Thailand while on a non-B visa?

The question addresses the process of traveling from Thailand to the UK and back with a non-B extension of stay, focusing on whether a single re-entry permit suffices when transiting through Bangkok. According to comments, if the traveler does not enter Thailand during the layover, one re-entry permit may be sufficient for the return. However, if they do enter Thailand during the transit, a second re-entry permit will be required.