Luke Goss, it looks like you have answered your own question. On a more serious note, in principle all Thai Embassies are pretty straightforward, just go on their webpages and they list the requirements. As long you are a newbie here you will have no problem to get visa ,even in the more difficult places, like S'pore or Phnom Penh.
From my understanding you can use only Mae Sai for OUT/IN on multiple entry Thai visa. The only border that makes it difficult is Aran/POI Pet at Thai-Cambodian border.
this is about Thai Visa. From personal experience I can confirm that it is very easy to get Business visa for Cambodia at border and the extensions inside Cambodia.
Duncan Riley please explain. I did not try to sell anything on here, just a verification that people need to show Bank Statement for tourist visa application at the Royal Thai Embassy in Phnom Penh and with 5 minutes of google this person would have known the requirement. .