Post
Region: Lazarus
In the seven elections between 1945 and 1966, there were three where the Scottish voted differently to the English and got their own way. The Scottish didn't get a government they hadn't voted for until 1970. What had changed? It's simple. That's the election where the SNP first became a real political force, with their voteshare more than doubling from 5% to 11.4%. It hasn't dipped below that since and consequently Scotland has lost the control it had in Westminster. The SNP is the main reason Scotland gets saddled with governments chosen by England, so it's a poor argument in favour of their cause.
Representation isn't about having more MPs, it's about having a proportional number of them. Scotland gets a greater proportion of MPs in parliament than it has people in the overall population, whereas England has a smaller proportion.
It's hard to get statistics for the number of people who identify as British to some extent-the categories tend to be "British/British and other equally/other".