Form V765 is available if you want to re-register your vehicle under its original number, either because the vehicle missed the 1983 deadline or because it has never been registered with the Driver Vehicle and Licensing Agency (DVLA).
Download the form from the link below and fill it in. The form includes useful guidance notes and information including where to send the form.
To access the form you will need a copy of Adobe Reader. Information on how to download this for free is available on the right panel of this page.