While this is certainly helpful information, what's the likelihood of another NPC colonizing in Europe?

I know Tri Sigma had their chapter in Germany (the university has since closed, if I'm not mistaken), but distance is a really big factor. Just look at my school. Fraternity and sorority HQs are so very hesitant in even considering UH-M because of the distance (in addition to how many alums they have living here, of course).

I speak from experience. Hawai'i is part of the US, but sometimes it really feels like we're in a whole 'nother country.

While it would be great to see an NPC collegiate chapter in the UK, the OP may be better off starting an organization from the ground up. Good luck.