UK Traffic Law
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Hello! Thank you for writing!
It seems the matter is in court and you wish to dispute the ticket. Since this is a civil case, the parking company will have to show that you were given sufficient notice, through a sign board or otherwise, about the non-parking area, and you chose to park there.
If you are going to dispute, then you should collate as much evidence as possible to support your case. Take photos of where you received the ticket. With respect to missing out on witness statement deadline, you need to apply and apprise the court why you missed the deadline and seek an extension. If the deadline has passed, you need to apply for relief from sanction, which may be imposed by court. Regards