Draft below:
Dear Islington Council,
I’m writing to appeal the PCN on the grounds that I am a resident permit holder and have been for the last 5 years. I apologise for not renewing on time, I was wrongly under the impression that it would renew automatically but that wasn’t the case. I can only apologise and can assure you that this doesn’t happen again. I plead that on this occasion you cancel this PCN as a token of good will.
I attach evidence that I have been a paying resident permit holder over the last years, as well as currently having a permit which I immediately purchased upon realising it did not renew.
Regards