I'm English and lived in Scotland for 18 months, my DH is English too and still works up there. Holly has a Scottish birth certificate because she was born there. I was up in Aberdeen so we had a lot of darkness!
It was always a bit of banter that the Scots hate the English, but they'd never say it to your face. It was more noticable in the media, like when there were England sport games on the papers would cheer for the other side, that kind of thing. Also, when that Jade bird didn't go through on X factor - DH said there was a bitter media frenzy
A lot of English people seem to hate the Scots too. My Dad hates it up there, I think he was glad when I moved back here, even if it was to Yorkshire
I'm a londoner and find that there's a huge north/south divide too. My DH hates the south, and I'm always getting suvverner comments chucked at me!
I love Scotland, I really want to move back there. Great scenery, free prescriptions, free uni (at the moment), great people. What's not to love?