this be of any use?
[urlhttp://www.moneysavingexpert.com/reclaim/private-parking-tickets[/url
Quote Under contract law, private firms can give you a ticket, clamp you or remove your vehicle when you break, in their eyes, a contract formed between yourself and the landowner to allow you to park on their property.
Typically, this is because you’ve parked in a reserved place, overstayed or not paid in a charge-able space, or incorrectly positioned you car.
Check what type of ticket you've got
Parking tickets can be both from official public bodies, like local councils and the police, or private companies. This guide is about fighting unfair tickets issued when parking on private land (eg a supermarket car park).
If your ticket is from a public body, instead please read the Appeal Council Parking Tickets guide.
Don’t fall for any disguises
Some private tickets do better impressions than Jon Culshaw. To add legitimacy, their phrasing and design is often carefully contrived to give the sense it is a police or council ticket. They often use chequered lines or call them PCNs, mimicking the Penalty Charge Notice acronym of official council tickets.
Yet if it’s from the police or council it will say so and it's a completely different process and set of rules. '"
What do you think?