My speculation is that, if Scotland really becomes independent, it will rejoin the EU and adopt the Scandinavian model. And it's main trading partner will shift to the Scandinavia.
Remember that a significant part of Scotland is actually Nordic. And some social norms in Scotland in closer to Scandinavia rather than England, for example, in Scotland, we have a right to roam in general, but not in England and Wales.
I can foresee Scotland adopting the Euro, metricating its roads, increasing their taxes to Scandinavian levels, continuing their free universities. And depending on its integration with Norway, CTA break-up is possible when more people are taking ferries to Norway instead of going overland to England.