That was already discussed before but there was no real decision as I got not much comments on my questions.
I think indeed that many should be labeled as European.

I suggest to label them like what Wikipedia DE made:
http://de.wikipedia.org/wiki/Ford#Zeitleiste_der_europ.C3.A4ischen_Ford-Modelle
red = UK
blue = DE
green = FR
yellow = US

Except:
- Escort I which is British
- Maverick which are rebadged US or Japanese models