Well, I laffed my bitz orf.
Plod pulled us over, I wound down drivers window, he said, "good afternoon sir, are you the DRIVER of this vehicle" I said "excuse me I did not hear you", he then said, "are you the DRIVER of this vehicle sir". I started laffing, my wife banged my arm to stop as she knew I was gonna say something he may not have appreciated.
He then realised what he had said and laffed himself, then waved me on.
Still do not know what the stop was for.