Sovereignty and Brexit

As a UK Referendum on EU membership gets closer, much is being made by those urging exit of the idea of national sovereignty. Indeed for some Brexiters this is the defining issue. What they mean by sovereignty seems to be that a country can make its own laws and act independently of all other countries. Whether such a situation ever obtained is highly questionable; but it certainly hasn’t obtained for the UK or any other country in recent times. Like other countries the UK is bound into a web