I have QQ plates on my 1985 Ranger. I did some investigating, and found out that, not officially mind you, that the QQ at the start of the tag actually stands for a human action:
This "action" would be a pair of eyes ogling at the antique car. Historic plates was started here in Jersey by a well know and famious packard restorer, whom got the QQ tags passed. I am of the understanding that the QQ on the tags are his idea of a pair of eyes "Gauking" (spelling) at the antique or classic car.
Interesting...