Is the Windsor Framework a get-out-of-jail card for Scottish nationalists? The excitement expressed in SNP circles at Rishi Sunak’s Protocol breakthrough yesterday was palpable. For if remaining in the EU single market while staying in the UK is good for Northern Ireland, surely this could be the case too for an independent Scotland? Isn’t this the ‘best of both worlds’ scenario that Nicola Sturgeon always asked for: borderless trade with the UK after Scotland joins the EU single market? A bonanza for Scottish businesses, who would be able to access markets in Europe free from Brexit red tape? Perhaps even...