Just an outline.
My father parked near his home where he was not aware that it had become a parking zone. Parked on the road side where he did not notice any signage stating he was not able to park in that area. He later received a parking fine and disputed it sending evidence of where he parked and where there was no parking signs stating he could not park in the area as well as the information below:
On page 52 of the Department of Transports booklet ‘Know your traffic signs, 2015