The plate belonged to one of their technicians, who bought the plate from him and put it on retention. It was Edinburgh VW FYI
I just applied my private plate to my car. I put it on retention when I sold the Golf and paid £105 for the privilege. The costs breaks down to this:
£80 flat rate to put the plate onto a certificate (on retention)
+£25 for 1 year's retention, or
+£50 for 2 years, or
+£75 for 3 years.
By putting it on retention I got a certificate to prove the plate was mine, this also allows you (certificate/plate owner) or another person (nominee) to put the plate on another car.
As the £80 has got to be paid already, ask the VW technician for the certificate and get him to fill in (with you) the nominee section to allow you to put the plate on your car under your name. Once this happens, you now assume ownership (and responsibility) for the plate.
Your local DVLA office will be at the Gyle.
Out of interest, are you local to Edinburgh?