what you describe is patriotism, not nationalism.
Being proud of your country is one thing. Believing that your country would be better off without all the others (nationalism) is a whole other.

I'm a (mostly) Englishman in Scotland, so I'm in the same position I guess.

A loyalty to you and yours is a perfectly understandable position, the problem becomes when it starts to actively include "to the deliberate detriment of others" ... but that's a whole other kettle of worms. More specifically, in this case, the "Loyalty to you and yours to the active detriment of others" holds "yours" to be "the British" and "the others" to be every other nationality and I think that's a pretty nasty position to hold.
( the mighty badger Aphrodite, on a bar stool, by your side, Thu 8 Apr 2010, 9:28, Reply)