Fair do's. That's what happens when you make assumptions. Sorry.
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I'm disappointed in your answer but only because I've never understood SNPs stance on this and thought you may be able to shed some light on it. We don't get many Scottish posters on here.
The SNP position is actually quite interesting. For the second independence referendum to be won, they will need no deal to be avoided.
It sounds counterintuitive given no deal would seem to make a yes vote more likely in Scotland. However, if Scotland is an independent member of the EU (as would be likely) and the UK is in a no deal position, we just end up with the same backstop debate as for NI but along the England Scotland border instead, meaning there would need to be a hard border in place for customs reasons (or at least until a trade deal is reached).
My view is that Scottish independence will now happen and the UK will break up. It’s just a matter of time.