that's exactly the same as me. Flying from UK in 2 weeks. I won't do the TDAC but my husband will. Let's see if it works with online check-in without TDAC. Flying with EVA air
because I bought our flight using English passport so my ticket is matched with my name. Also I've just had my Thai passport issued from the Thai embassy in London after I bought the tickets
You are still married for sure and the same law is recognised in UK. You will not be able to get married legally unless you have a decree absolute (Thai version) a proper divorce paper stamped by the local khet where you were married