The dvla won't allow any rude plates to be sold. Sadly. They are non existent and they have thought of most in advance before it's too late....
in the late 80s IIRC there was a mini parked outside a shopping parade up on Bransholme with the reg plate GAY 50D
PEN 15 is a real plate, was (may still be) owned by a bloke in Wilmslow. I have seen it many times although not recently.
My missus' next door neighbour(when she was a kid, we don't live separately) used to have HRH 2 on a mini metro and flogged it to the queen.
Bizarre I was only telling the wife on Sunday that I'd just seen the Aston with HU11 CTY plate nr Willerby on Sunday. She wasn't interested!