I'm 'English' and therefore a 3000+ years mongrel in the making as in celts, romans...which It's self could encompass most of Europe, North Africa, the near east, middle east, turkey etc. Then theres all your angles, saxons, jutes, danes and other sundry scandinavian johnnys, French, Flemish...basically your uncle tom Cobbley and all.
MONGREL !
And, IMHO, all the better for it.