First thing to do is check whether or not the issuer is an ‘approved body’.
‘On private land, a parking charge notice will either be put on the offending vehicle or it will have been clocked by Automatic Number Plate Recognition (ANPR) camera and a “ticket” will be sent by post to the vehicle’s registered keeper IF they are members of the British Parking Association (BPA) or the Independent Parking Committee (IPC).
If the car park operator is not accredited, then they will be unable to get hold of your details via the DVLA and will find it hard to pursue you. It has been known for some motorists to make the process easier because they write to the operator to complain about having a ticket put on their car, and in doing so, provide them with their name and address.’
Check the car park for notices – are there any and are they clearly visible?
How would a driver become ‘authorised’ to use the car park? Are there any notices to that effect?
If they already have your address…..if you decide to contact them, do not say you are ‘appealing’ as this immediately implies that you have accepted liability – you are ‘disputing’ their invoice.
You may wish to consider requesting photographic evidence with date and time stamp verification.
As Cougar says^^^ ignoring their invoice is bad advice these days.