Dear GOD 'modify' (edit) that post, remove PCN and reg number ASAFP!
Then remove bit that identifies the driver, as per the read this first sticky!
Plan A - complain to the landowner, especially as this would have been issued by a 'boots on the ground' operative and may even be self ticketing.
I think you're saying the car was parked with a toddler on board and the car seat then moved so the operative would see no child seat?
Notice issued to windscreen or by post? (if by post maybe they saw no toddler return to the car).
Too many relevant facts missing, we can't guess.