Scot Nats probably need to take note of this because the economic impact of separation would be of this magnitude, and so the likely repercussions for political stability and collective goodwill over the decision likewise.

Whether "it's worth it" can fly is a different matter. Many might say so. Assuming a path back into the EU lay in the future, it might be. Decisions like the value of renting a nuclear sub base to England and the US would become important.