Hi guys, Thank you for your quick replies. As requested here is the back page of the NTO and the other piece of paper I received.

I have received a Penalty Charge Notice in the post today, revealing that I was illegally parked on the 17th February 2010. I admit that on closer inspection this was indeed the case. However, on returning to my car that morning, there was no ticket on my windscreen. Thus today's letter is the first I have heard of the incident and due to the offense having been made in February, I no longer have the choice of paying the fine early and receiving the accompanying 50% discount. In fact when I retuned to my car, I actually saw the Civil Enforcement Officer leaving the scene on his scooter (parked just in front of my car) and because I saw no ticket assumed there was no issue. However, having seen a "ticket" on my windscreen on the attached PCN, I am now totally confused because I doubt someone would have removed the ticket from my car given the parking warden's proximity. I have no issue paying the fine, but feel saddened that I can no longer pay early to receive a 50% discount. Any ideas if I have a case here...