Some things I know about VINs:
first digit
"J" means Japanese (built, not country of company origin)
"K" means Korean
"1" means USA
"2" means Canadien
"3" means Mexican
"S" means English built
I'm sure every country of origin uses a specific code for the first digit. If your Triumph starts with "S" it was built in England. I'm quite sure if built in Thailand it would have the specific code for it.
For what it's worth, I'm glad my Speedy was built in England. I'm all for the Brit bike built domestic. But I'd feel pretty badly if the company went bellyup if it could be avoided by manufacture elsewhere. Money's money after all....... sometimes it sucks to be sure.
Cheers, Mike
