Can one country maintain two systems?

Does the example of England and Scotland show that one country can maintain two systems?

To an extent, provided the systems are clearly demarcated; the reply also notes that this example operates within a democracy.

England and Scotland are offered as a counterexample to the difficulty of maintaining two systems in one country. The brief reply accepts the comparison to an extent. It stresses clear boundaries between the systems and notes that the example operates within a democracy.