I would certainly not describe Scots as particularly dour, at least, not the ones I have met. It is more making a judgement from afar on how the leaders and members of the SNP come across in the media and in interviews.
It is worth remembering that many a person of impeccable rectitude in public has been found to have a private life that is anything but.
What Would You Do in this Position?
To think that London, or anywhere else for that matter, does not belong to any one demographic