I did a small amount of reading a bit ago, was interesting to read that Triumph cars and Triumph motorcycles, in so far as I could tell, had no affiliation with each other.
I can tell you that when I lived in England, saw a ton of Spitfires, and def loved the look and the sound.
I can also say that here in the US on the east cost, a well taken care of TR4 or TR6 can command some decent sale money. There is a TR4 for sale in the town I lived closest to and they want $35.5k in so-so condition!
They also have an older proper Austin Mini that they want a mess of money for aswell. I briefly thought, OK, go to the UK, buy a handful and bring them back, refurbish them, and sell them for a shiny coin...well, that Mini has been on the lot for a year....