I had an epiphany way back in 2015.
A fellow Yes campaigner who had just become an MP, who I still count as a friend, told me that then MP leader Angus Robertson had taught him to do his tie in a Windsor knot, because he wanted the SNP contingent to be the smartest in the H of C https://twitter.com/liz6153/status/1245650505654611970

They did well not to select me on vetting. It is not what you look like, it is what you do. And I would see the role of an SNP MP as inflicting as much damage as possible on UK institutions till they want shot of us, not being an ornament to the British constitution.