I'm pretty sure of that, but have no way of confirming it, except that on the project I'm working on, with peaks of over 200 people, only the Brit expats ever get called.
I've also had this feedback from people at Novartis who also did an 'awareness' shout, and found the same thing, Swissies and other foreigners never get called. Maybe it's just a language thing.

However, that's moving away from the point of the post. Also, I know some of these salesmen are EF members, so maybe they'd care to explain who and why?