Aww, why must Britain be divided?
I always refer to myself as British rather than English because I love Scotland and Wales as much as England, probably more actually since I live in England and the grass always seems greener elsewhere when you're surrounded by Chavs.
When I lived in Nottingham, I did notice a lot of animosity towards Scotland from my family and people surround me, which I never really understood. Since moving up to Newcastle, you don't get anything like that here, but we're not too far from Scotland anyway. You do get the occasional Scottish note here too from shops, which is always cool. Scottish money is pretty :3
Don't really care about Northern Ireland though, not offence to any Irish. I visited Belfast a few years and that place just didn't have a nice atmosphere at all.