Just came out of supermarket with 4YO DD in tow, and as I was loading car, chap pulled up and asked me if I was leaving. I said yes, then noticed that he didn't have any kids/car seat (was probably well in 50's), and pointed out to him that it was a parent and child space.
He ignored me and stayed put.
Another woman came along who had at least 1 pre-school child with her and really needed the space, wound down her window and told him it was a parent and child space he was waiting for that he shouldn't be using.
He completely ignored her and stayed put.
I spun out sorting myself out as long as poss but he just waited and eventually pulled into my space as I drove off.
So I pulled up further down the car park, phoned customer services at the store and reported him. I was just not in the mood for that kind of crap, but I do feel a bit pathetic for having done it, even though I know I was in the right in theory.