Weird. Lived here all my life, only time I've ever heard it is in "look at those wacky Yanks" conversations. South coast/London here. Maybe it's regional?
You should check your stats some time and see how many of your users fail to load your JS, rather than are capable of loading your JS. You might be surprised, especially if you have lots of mobile traffic.
My college had an (experimental?) machine they got from Acorn that dual-booted into a 'nix OS. It got stuck in a corner and forgotten about, but if it had been a few years later I think it could have been an amazing project for them.
Maybe when the market's a bit worse I'll be forced to jump through one of these hoops. But right now...