Scottish split a ridiculous non-starter
Imagine the situation. Some 75% of Scots vote for independence. The Edinburgh and Borders region, however, votes mainly pro-union.
Determined to remain in the UK, the unionists insist on partitioning Scotland so they can remain with England. A new border is drawn to incorporate as much territory as possible, while maintaining a suitable unionist majority.
Two new countries are created - Scotland and Southern Scotland. This leads to a lot of disgruntled Scottish nationalists in both parts and possible trouble for the future.
Of course, such a ridiculous scenario could never happen...