reasurance on where to start with PCN

My issue is that my employer had told me that we could park in the adjacent carpark as the building was owned by the same landlord. I was parked there about an hour (5pm to 6pm) for a meeting.
Last Thursday my boss, a visitor to the business and myself were issued with a ticket. My boss then muttered to me that they were told they could park in the car park until next week or that PCM LTD were going to start their patrol next week.
(I have read your NEWBIES post)

My employer is aware that I am going to appeal this parking charge, and have asked in the first instance that she gives me the contact details of the landlord. I intend to complain to them in the first instance citing lack of communication with regard to when the permitted parking was due to commence. Clearly my boss had the same intention as me...in addition to all of this I had to bring my children to this brief meeting as had no child care, so the whole thing took longer.... (and a major code brown nappy incident in the office )

Is this a sensible thing to do in the first instance? There was clear signage and I have seen the 15 photos the attendant took of my car and the surroundings.Sadly I assumed that I was allowed to park there, lesson learnt now...I won't be parking there again!
Is it worth going down the PCM appeals process explaining all of this?
I had a look at the appeals form and it asks for a name and address etc....and I was unsure as whether this would be as good as admitting fault and having your appeal rejected before starting.


Many thanks in advance