Triumph own a factory in Thailand. In fact (though I'm too lazy to google it) you can find it just east of Bangkok on Google Maps.
You are absolutely right:
From the web
"Here's the facts:
Triumph Motorcycles (Thailand) Limited
Address: Amata Nakorn Industrial Estate
700/485 Moo 2
Bankao, Panthong
City: Chonburi
Post Code: 20160
Country: Thailand
Background
Triumph Motorcycles (Thailand) Limited are a 100% UK owned company that currently operate 3 factories in Amata Nakorn Industrial Estate, Chonburi. Triumph's first factory in Thailand was opened in May 2002 and was established for the manufacture of motorcycle components including Frames, Fuel Tanks, Header Systems, Swinging Arms, Engine Covers and Chrome Plated Parts. A second factory was opened in 2006 where a wet painting facility and assembly line have been established. A third factory, opened in 2007 includes high pressure diecasting and machining. The company now employs approximately 800 staff in Thailand.
Products or Services
Production of motorcycle components and assembly of motorcycles for export markets. Processes include; Aluminium & Steel welding, CNC Machining, Laser Cutting, Polishing, Chrome Plating, Powder Coating, Wet Painting and Assembly.
and from Wiki
At 21.00 on 15 March 2002, as the company was preparing to celebrate its 100th anniversary as a motorcycle maker, its main factory was destroyed by a fire which began at the rear of the facility. At the height of the blaze over 100 firefighters were tackling the fire which destroyed most of the manufacturing capacity.[9]
Nevertheless, the company, which by then employed more than 650, quickly rebuilt the facility and returned to production by September that year. Furthermore, in 2003, Triumph opened a new manufacturing facility in Thailand. An assembly and painting facility in Thailand was opened in 2006 by Prince Andrew.[10] In September 2008, Triumph announced that they were expanding their Thailand factory to increase capacity to over 130,000 motorcycles.[11] "
So it looks like they have about 60% of their worldwide employees in Thailand. I would still argue that the Triumph is a British bike through design and development - taking advantage of lower paid, but skilled labour. Back to the theme of the thread - ImO it would be great to see thim in MotoGP, but I,m not going to hold my breath on Triumph taking that step.