The King is following Royal convention. When Queen Elizabeth II’s father, George VI, became king, his wife’s title became “queen consort,” although she was usually referred to as “Queen Elizabeth” (having been born Elizabeth Angela Marguerite Bowes-Lyon, not to be confused with Queen Elizabeth I of England, daughter of Henry VIII and Anne Boleyn). Queen Elizabeth held her title until George died, at which point Elizabeth II ascended the throne, and her mum became “queen mother.”
I really think that Queen consort Camilla is a bit long winded.
I'm all in favour of having a King and Queen.