@b789 Thanks for detailed response.
If I had known about this site before, I would have come here for guide. I have attached the pictures they have on their website with no one in the parked car.
As for th appeal, I based it on th basis that I received original PCN very late and was honest that I went I shop next door to use the toilet thinking honesty will pay off but from my experience, they care more about money than nature call.
The fact of the matter is, it was evening never so realised there was the notice and made my way to shop next door when they said, there is no customer toilet on site.
They also posted a picture of me entering the petrol forecourt and no one on passenger seat.
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