You need to respond to the council in writing before the end of the period 28 days beginning with the date the vehicle is released, on the form provided when the vehicle is released. There is a section of the form which can be used to set out your response. At this point copies of all evidence must be sent in.
The council will consider the formal challenge. If the challenge is successful, the PCN is cancelled and the monies you have paid will be refunded.
If the challenge is unsuccessful, the owner will be sent a Notice of Rejection(NOR) and a Notice of Appeal form (NOA) - a form to be filled in and submitted to the Traffic Penalty Tribunal.