As I lived in Houston when the "Houston Texans" franchise was moved there, the analogy could be "London English" or "London Brits"
What about London Redcoats?
Probably would be a sore spot still. There's been a minority movement only starting to get real attention a few years ago over the Washington Redskins' name, something tells me it wouldn't go down to well the other way around. The Redskins owner is firmly against a name change, South Park
took their best shots at it recently:
Are Houston's team one of the likely ones to move? The London Texans has an even more brilliantly confusing ring to it, I'd love to see a team come to London/Europe with a misplaced name, like the Flint Tropics, or the LA Lakers...
P.S. The Montreal Canadiens also have a redundant name, but do they get a pass for historical value?