This allegedly happened!
Easyjet holding at a certain london airport, about number 10 in the stack. On freq there pops up a new callsign who is immediately given a radar heading, descent and told to contact arrivals.
Easyjet capt a bit peeved and queries why this aircraft has priority over everyone else. The response from ATC, "It's a royal flight and I can only give you priority if you have any royalty on board."
response from EJ "I have acouple of Queens down the back. Does that count?"