Bailster
[10] Knight
Rock and Ivy are the two Brits (Up to 3 if we count Arthur)
Dutch independence isn't recognized for 39 years after SC5 (though 80 Years War is as good a motivation for SE seeking as anyone else has)
Do we even know Salia's nationality (if we are discussing nationality)? I can't find any origin for the name, though I'd have to guess she's from somewhere in the HRE given her presence in the merc group.
I mentioned this in the roster spec thread, but I think she is at least from a German-speaking country mate - her surname is "Olschmidt", which is defnitely of that origin. She could be (originally) German, Austrian or Swiss.
"Salia" is a variation of the more common spelling "Sally", which is itself a diminutive of the hebrew name "Sarah" - meaning "princess", so basically her first name is pretty universal and hebrew names appear in a huge variety of cultures.