I have a private number plate on retention certificate. The plate cost me £400 5 years ago and i've had it valued at £450. It's on retention certificate ready to be put on a car. I'm after a quick sale so i'm willing to take a cut price on the plate of £250 or if anyone has anything to trade then let me know!!! You could sell the plate on for a nice profit , but due to my finances i have to let it go cheap!!!