+1
We see lots of cases on here where people have failed to update their V5 when moving to a new address. The outcome is very seldom favourable to the OP, because they are in a mess of their own making, in not updating the V5.
Yes, it is a harsh lesson, but unfortunately there is no easy get-out, I'm afraid. Just for your information, the only avenue to revert the matter back to the original PCN is to submit an Out-of-Time Statutory Declaration to TEC that you didn't receive the PCN. Problem is that you have to explain why you are submitting out-of-time, and your reason would not be allowable. In addition, the council (or TfL) can and will object to your submission, whereupon it is rejected. You can request a County Court judge review. This costs about £110 for a papers-based review, or £255 for an interview with the judge. Neither of these sums is recoverable, and if the review is refused, you'll still have the bailiffs to pay..