Q380: I have just sold my car but I did not get the buyer's name and address?
It is your responsibility to inform the DVLA when you sell or purchase a car. Both the buyer and the seller must complete the relevant sections on the V5 – see Q916.
The law provides that where there is a change of registered keeper the existing registered keeper must notify the DVLA – if they fail to do this they could be fined up to £1000. Additionally, they will still receive any documentation from any organisations relating to that vehicle e.g. parking fines.
You can now tell the DVLA you've sold, transferred or bought a vehicle online via the link below:
https://www.gov.uk/sold-bought-vehicle
Note that in order to have done this the seller must register the vehicle to the new keeper online.