Why is it a “concern”? If the majority of people in Scotland want to secede from the UK, let them. That’s what freedom and democracy are all about. Plus they will then be a drag on other countries in the EU, England will no longer need to carry them.
That’s the other issue. If Scotland were to secede from the UK, Labour would be utterly finished. England would be better off. Scotland is a net recipient and its not that close.