Can I apply for a multiple-entry visa to Thailand with my UK passport after using my Australian passport?

@Stuart ********

as if all.posts here are on the level. But as I said...it "is highly unlikely".

@John-Paul *****

You can believe what you like. Your call. You also mentioned that Thai immigration don’t look at faces. I’m not sure when you last entered Thailand but if it’s been in the last few years your photo will definitely have been taken on entry.

@Stuart ********

Not wanting to get into a vast conversation on this subject ... I was referring to facial recognition by their system. Yes, photos are taken, but the question is whether the system has stored them and then can cross reference them based upon different passport numbers (which are kept by the system... along with any yellow or red flags associated with the individual). That said, perhaps the Thai system is on par with ... say the UK, the US, Canada, Switzerland, Israel, or the EU, just as a few. I doubt it.... given that Thai Immigration cannot get their 90-day system to function consistently and Swampy's systems go down regularly. But okay... I hear you. Maybe my use of the word "highly" was too much. My apologies.

@Stuart ********

Yup, I saw a month ago at the immigration counter that on the computer screen they have two photos next to each other (scanned passport one and the one that they take when you stand there). Then there was a % bar which shows how similiar these photos are. So they definitely check your face :)