It’s very simple and straightforward. I’ve done this 5 times now for my GF. just complete the form online. Then gather all your information to back up your relationship ie video/phone calls and photos of you both.
Proof of reason to return i.e rental agreement/home ownership and details of any dependants. She doesn’t need to have work as you will be sponsoring her in the UK
I’ve just had a message from the Thai Embassy saying they’re dealing with January flights at the moment and will be in touch soon. Thanks to everyone who contributed with informative advice