Originally Posted by Britannist

Indeed, the United Kingdom - as a legal entity recognised internationally - could continue even if England were its only member under certain circumstances. And England as the only member of the UK could use the name UK in its membership of international institutions such as the United Nations (UN) where the seating of representatives is decided by alphabetic order. This would enable England's member there to sit next to the person representing that most powerful of nations and our largest single trading partner - the USA.

I would also add that even if the UK did have to formally dissolve due to the departure of Scotland there would be nothing to stop England, Wales and Northern Ireland forming a new United Kingdom and reviving its name. A United Kingdom comprising Wales and England did, of course, exist for centuries before the 1707 Act of Union with Scotland.