Hey Guys,
Random thought, but how could you make all the 'best bits' of Scotland (i.e. The lowlands) have a predominantly English population and thus be an official part of England (annexed by England), while the bits left over (the Highlands) are still very Scottish before a political unification (if there would be one in such a timeline).
I was thinking something along the lines of England winning wars against the Scots then either moving them [the Scots] overseas in large amounts, or through mass immigration of English settlers or something.
How could you do this? The POD has to be after 1250 at least.
Go!