I must admit that, like Northern Ireland, I don't have any strong feelings about whether Scotland remains tied to England. I live on the south coast of England, just about as far as possible from the Scottish border, so I can hardly claim to have a direct interest. Like Northern Ireland, I'd be happy for the Scottish population to self-determine, but I'm not fussed which way they go. I'm certainly not a unionist in the case of Ireland and frankly, don't see Scotland (or Wales, for that matter) as any different.
Furthermore, I have a good amount of sympathy for a Scottish Independence referendum. Not because I'm either pro- or anti-independence, but just because the earthquake of Brexit has drastically changed the landscape compared to the earlier referendum.
I think the effects could be interesting, however. Presumably, if Scotland did vote fore independence, the UK by then would have left the European Union (although that in itself is a big "if"!). So they'd be wanting to join the EU just like A.N.Other nation. One of the conditions for joining the EU these days is that a state must at least be planning to join the Euro. Not actually adopt it, but plan to do so. So a knock-on effect of independence might be to ditch Sterling. Equally, I suppose the nationalist reaction is "so what?" I suppose they would just be going from one circumstance where they can't really set monetary policy (Sterling) to another (Euro).
It's interesting that as far as the UK is concerned, we too would nominally need to adopt the Euro, should some future government with to rejoin the EU. I suppose that's one of the things you negotiate on entry, but I can't help thinking that the reaction of the English to ditching Sterling might be somewhat more reactionary than might the Scots.
I mean, these are all just musings but, certainly, a subject with a surprise around every corner.