@Benjamin *****
Hi, each stamp in the passport following the ED visa seems to be an extension of stay as you thought. There's the original ED visa stamp then three extensions of that done every 90 days. I was under the impression that the ED visa was valid for a year and you just needed to check in every 90 days. So am I then classed as being on an extension of stay visa based on the original ED visa?
The lady at KP immigration seems to be convinced that I can change to the COVID extension at either Samui or Surat, however I don't really see how they can be different from immigration on KP in terms of whether or not they can change over the visa.