Racism can easily include ethnicities/nationalities such as English and Scottish. The difference doesn't even have to be real considering race as a whole is largely a social construct once you get past the melanin.

Just look at the Irish being excluded from "whiteness" in the 19th century.

Hell, it's in Britain, and there's Old English uses of the term "races of men" that use race to basically mean tribe or clan.

Would it make you feel better to call it "clannishness?"

All that said, I don't think this is the kind of racism, the expression of nationalistic grudges, you need to bust out the placards and start marching in the streets against.