https://www.learnthaistyle.com/learning-options, started by a Thai lady living in the UK. I thought I would share it as I have benefitted from it immensely.
There is a variety of options, "basic speak Thai", "speak every-day Thai", and "read and write Thai", through to corporate packages. There is a one off registration fees (I went for the Read/Write course at £139) and you get excellent printed material and audio files to keep for life. You sign up with a native Thai teacher, either locally or via Skype, for £12 an hour in the UK (£15 if you're in Thailand). It's less impersonal than a classroom or distance learning option although maybe not for everybody
Personally I went for face to face tuition with a local teacher. The Thai teachers all have excellent English, and they can give insight into Thai language and culture that no westerner who's lived out there for a lifetime of Sundays would ever know. All I'm saying is that the course is well structured, has been well thought out. I've been learning for 20 months, my teacher has finished her university in the UK and moved back to Bangkok now but she is now a friend of my wife and myself and has help my Thai speaking immeasurably. As I've benefited