I can see the logic of having a default choice, but UX really shouldn't assume its users don't have a passport.
Plus the real purpose of the feature is to showcase that it can return lists of politicians by nationality/body for many countries. At individual politician level, I can find a whole lot more information by typing their name into UK-specific sites (some of them actually run by the same people)
> Find representatives from your country:
Expected to use the box to find representatives. Instead it's a place to enter your country.
You should already know my country. Let me type in a representative's name.