If
you transfer your vehicle to a motor trader (see note*), and you are in possession
of a registration certificate (V5C) you should tell the DVLA of the sale using
the V5C/3 section (yellow) and pass the rest to the trader.
If
you are in possession of the three part registration document (V5) you should
send the V5/3 section (red) to DVLA and pass the rest to the trader.
If
you are in possession of the two part registration document you should send the
disposal slip V5/1 to DVLA and pass the rest to the trader.
(*For
this purpose motor trader means motor dealer, a motor vehicle auctioneer, a motor
vehicle insurer with whom you have settled a claim for total loss, a motor vehicle
dismantler (scrap yard) or a finance company with a financial interest in the
vehicle).