Devolved Scotland continues its remarkable run as a provider of political entertainment — and, perhaps, as a teacher of lessons about nationalist movements, proportional representation (PR) or the Scottish political character itself, whose stamp Canada still bears. On Monday, Scotland’s First Minister Humza Yousaf resigned after only a year at the head of the Scottish government. Yousaf leads the Scottish Nationalist Party, which has a commanding position in the Scots Parliament at Holyrood. Or so he thought.