Two different issues here. The car being stopped because of its initially perceived north yorkshire origin i believe would be because the police would suspect it of being a ringed or stolen car.Why "Not relevant to North Yorkshire"?
Because that was the reason given for the stop!
Best you tell plod that there are no dodgy tykes driving around in nice cars!
(unless they are black of course )
You asked the relevance of being out of your area. The relevance of being out of your area relates to the gang postcode wars.