I have a Civic which is I believe is on a Northen Irish plate. It's like "XBZ 4321" (I assume this is from NI anyway). I have a certificate for it. Anyway, I want to swap this for a standard UK plate (not a private plate). Any idea how I go about this? I've tried calling the DVLA but got lost in the key pressing maze. Is my irish plate worth anything? even £20 would be nice to cover the cost of the probable admin fees to register a new plate.