Combining Brit Royalty and Wizards...?

[Steve]

Let's assume for the moment that the reigning King of England married
a witch before being crowned King of England, would that witch be
considered Queen or merely the wife of the king? 

In a sense, I am asking if the spouse of the reigning monarch also
holds the highest royal title, or is the highest royal title reserved
excusively for the reigning King/Queen.

Does that question make sense?

Perhap, restate one more time; are the reigning monarch and spouse
automatically King AND Queen, or does the title only reside with the
one who is reigning at the time?

If Hermione married Prince William (they are about the same age) and
Prince William became King, would that automatically make Hermione
Queen, or would she only hold the title Queen if William died and
Hermione took over.

Just curious.

bboy_mn