I was wondering too!..so as google is a friend of mine, this is what he told me:
British-Israelism (Anglo-Israelism) is the belief and teaching of a number of religious groups, that the 10 "lost" tribes of Israel are actually the Anglo-Saxon race and are specifically the people of Great Britain. By definition, then, the Anglo-Saxon (or white) people are the true Israelites, being the descendants of Abraham and are the only chosen people of God and heirs to the covenant of God. The people who are living in Israel today, calling themselves Jews, are actually impostors who mistakenly identify themselves with the Israelites, but are, in fact, descendants of Judah and are not the chosen people of God and are not part of the covenant of God..
http://www.ondoctrine.com/10brtish.htm
BTW greatkraw, do you believe this?