I think Tia is Dolly from 007, Invasian, and most of the other leading Thai agencies.
She was sharing a flat in Holland Park with Lily (Maya at 007), until recently when Lily moved to Mayfair and Dolly became listed as 'away/on holiday' on the agency websites. I've seen her twice, and I can say that if she's post-op she certainly fooled me. I'm 99.9% certain she has never owned a penis, but, if she did, then that's one seriously convincing transsexual.
Hell, even if she was a bloke previously, I'd still go back. Although, I'm thoroughly convinced she wasn't.
I'm actually trying to remember now, whether or not she had a cesarean scar (it's hard to keep track of which Thais do, so many of them have them).