Of course the obvious corollary is that much of Scotland's existing banking/corporate HQ sector does far more business in the rest of the UK than in Scotland, and some of those divisions might need or wish to relocate to somewhere in the rest of the UK rather than stay in a newly independent country of 5 million people that hasn't fully sorted out divorce terms with the UK never mind developed trade links with the rest of the world.

Where EU links matter, a newly independent Scotland that might join the EU is a far less attractive destination than many other nations whose EU membership and other trade relationships already exist. Where EU links are less important, London has the considerable advantage of network effect, access to the 55 million remaining Brits under English law and regulations, and by then at least some idea of what its trade policy with the rest of the world might look like. Can't see the SNP wanting to start a corporate-tax cutting race to the bottom either.

Those Scots that (with considerable justification) are very unhappy that the rest of the UK voted them out of the EU with all the uncertainty and damage to trade that entails might want to consider that the same arguments apply to leaving the UK. And Scotland does a lot more business with the rest of the UK than the EU