Occasionally.
Historically, Scotland was a separate country (actually, a collection of kingdoms and fiefdoms), but it was dominated and overrun by English forces.
It really became a separate unified country when the Roman Army failed to take it over, gave up and constructed a wall across all of England (Hadrian's wall) to prevent the Scottish Hordes from getting in. Until then, I don't think the Scottish hordes even thought of themselves as a single entity.
In any case, they organized, and over the years have been attacked numerous times and taken over and ultimately become members of the United Kingdom when the Parliaments agreed to combine around 1707.
Of course, that was hundreds of years ago, and being a part of the United Kingdom isn't really all that bad, but every time someone in Scotland sees the crown do something they don't like, they threaten succession.
This is as likely as Texas succeeding from the United States. Great to talk about, but if it did, it would be the economic end of it.
At this point, I think the hatred is at the level of rugby teams, not slicing each other's throats as they drive up and down the M1.