PCN issued at Liverpool John Lennon Airport

I will start from the offset and apologise if I come across dumb having read the thread for newbies to READ FIRST and still post, but really I am not, I am just in the throws of being shocked to have received a PCN and my head is spinning as I try to consolidate all info on previous threads

So I just want some kind experienced soul to offer some guidance. Secondly appologies for the waffling as I try to recount the facts.

The week before Christmas I hurriedly rushed out from home with my 14year old son, but forgetting my bag with mobile/purse, to pick my mother up and drop her off at Liverpool airport. I very rarely fly and so rarely visit this airport. However, my mother had received a ticket for a flight from Liverpool airport, paid for by my sister for her to visit my sister in Jersey ( the first trip since my father died suddenly from cancer).

I pulled off Speke Boulevard and not being local, was suddenly presented with a signs that had changed since my last visit and I was trying to make sense of where I should now go for the 20min free pick up /drop off, without being pomped at for switching lanes or slowing down to be even able to read the signs properly. So I turned right at roundabout you used to turn left at and was presented by signs to hire car return but at that point no pick up /drop off sign. To the right was a barriered car park but I could not yet see where the entrance was and as the last thing I wanted was to enter a car park I would have to pay on leaving, I made the now unfortunate decision to reverse into a very wide entrance to a place on my left to take stock.

On doing so I noticed a small white van that I took for being a car park attendant,so I jumped out of the car and ran over to him for advice. I must admit he was reluctant to lower his window, when I gesticulated for help he finally did and I told him I was trying to find the 20min free drop off/pick up area and was there a bus to take my mother from here to the airport entrance. His response was a sullen brief 'yes there is bus'. As I got the distinct feeling he did not want to be bothered by me, and my engine was still running, I put his unhelpful response down to me presuming he was Eastern European by his accent (the very few words uttered were mumbled!) and that I did not have the time to try getting anything further out of him.

I ran back to my car finding my mother had decided to get out. Now my car is very high off the ground for her and I did not have the heart to say get back in and I will get you you back out once again when I find the relevant place ( she had her 2nd knee op mid way through the year and struggles with getting in and out of my particular car). So we made the stupid split second decision for her to walk the distance from this point to where we knew the entrance to be. I took her wheeled suitcase out of the boot and from the notice this is when the same previously mentioned 'car park attendant ' took the second of three photographs! The first being when I was making the split second decision with my mother (well as the time between photographs show it was actually 12 secs). The third photograph is a close up of my number plate bit on the first two my door is clearly left wide open, showing how brief the stopping was intended to be!

My blood boils that the man I actually stopped and got out of the car to ask for help to, was the one who went onto take photographs of me. I find it underhand.

Now the letter date of issue states 22/12/15 and thus means it has been stuck in holiday back log at Royal Mail and so only able to act on it today, I also have until tomorrow to pay the £60 afterwhich it goes upto £100, so hence the reason for my hysteria.
If anyone would be so kind as to offer advice thus restoring my faith in humanity, I would be so grateful. Thank you