Last bullet point
The third bullet point:
 even though part of the ruling nation within the British Empire, a tendency of many Scots to perceive themselves as victims of English colonialism and cultural imperialism within British institutions, such as the perceived marginalisation of coverage of Scottish affairs by the BBC.
does not seem to me a manifestation of the Scottish cringe at all. My understanding of the cringe is that it is essentially a sense of inferiority or embarrassment at all things Scottish felt by some Scots themselves. Someone manifesting the Scottish cringe would therefore be unlikely to feel hard done by any marginalisation of coverage of Scottish affairs by the BBC. They would be more likely not to acknowledge any marginalisation or to see it as natural and proper.