@Paddy C I'm glad you are comfortable about taking a space which may exceptionally be required by a stressed out parent with a clatter of kids in tow.
Personally I'd be embarassed to take one of these spots and wouldnt even do it if it was the last one in the carpark.
I would agree wth you 100% during the day, but at night I can't see the problem with it. There's no way every parent space is going to be required by parents late at night.