Are you prepared to risk being sued at the small claims court?
Does the DVLA have the right address for your vehicle?
Have you received literally nothing through the post at all?
There isn’t really much point in writing to them. They will completely ignore anything that you say.
If they were to sue then you could argue that the original PCN was not issued properly. The fact it wasn’t issued properly is a non issue from the point of view of whether they can pursue the claim but it does, if you were to succeed, mean that they couldn’t rely on the presumption that the registered keeper is liable for the fine if he doesn’t name the driver within 28 days.
I wouldn’t tell them that though. They will only set about trying to prove that they did send the PCN out in time.
Can I clarify anything for you?
No. All that will do is alert them to the fact they may have a problem with their evidence.