They are not built in Thailand. All this fuss is for nothing. As of today I accessed the U.S. version of the Triumph website.
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ABOUT TRIUMPH
Born, bred and proud to be British.
With over 100 years of history behind us, Triumph is a privately-owned British company. Our motorcycles are designed, developed and built at our factory, one of the most technologically advanced plants in the world, which is located in Hinckley, in the heart of Great Britain.
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So, you see according to the Triumph they build them in England. They would never lie to anybody would they?