However, where do we stand with regards to this parking charge?
There is no 'we' - one person will be named on the Notice to Hirer, and it is that person who will need to deal with this. I don't say this to be pedantic - we see a lot of cases where someone tries to be helpful and sends off an appeal in their own name, despite not being the person to whom the charge is addressed, leading to complication.
The notice is addressed to the hirer of the vehicle. By default, the driver is liable for the charge, but Parkmaven have no idea who the driver was, so they have written to the hirer. If they want to recover the charges from the hirer, they need to comply with the requirements of Schedule 4 of the Protection of Freedoms Act 2012 (there's a link to it in my signature under this post). One of those requirements is that when they send the Notice to Hirer, they also send the following:
- a statement signed by or on behalf of the vehicle-hire firm to the effect that at the material time the vehicle was hired to a named person under a hire agreement;
- a copy of the hire agreement; and
- a copy of a statement of liability signed by the hirer under that hire agreement.
Did Parkmaven send any of those documents with the Notice to Hirer, or just the Notice to Hirer? If they did not, the appeal jfollows suggests is a good first step, sent by the hirer, not identifying who was driving.