@Graham *****
do you see the difference between myself and the OP as opposed to your situation? No??
Your wife whom you are married to …. and OP girlfriend and my partner. Neither of us are married. I’m glad your wife was able to get a tourist visa without jumping through the hoops that we have to jump through.
I showed uk visa applications my Thai retirement visa , evidenced my relationship and swore an affidavit in support of the application, I am also a UK solicitor. I exhibited my bank accounts showing ample funds. The refusal letter stated that the applicant , my partner, needed to have their own funds in a Thai bank account AND show ownership or long term tenancy of a Thai property in their own name before a visa would be granted.