Any "Curb your Enthusiasm" (TV Show) fans)? There is a whole episode about using or not the disabled toilet - very funny.

I think if you are about to wet yourself or worse and there are no other toilets around that are free then is acceptable to use the disabled as just a lone adult, and there may not be an outward sign of being disabled. There are occasions when I think it is ok for non parents to use the parents room toilets also but not many - I remember once on Southbank approaching parents room and the toilet next door to it was occupied and this guy was clearly busting to go - I said to him I will check and if no one else is in the parents room he was free to come in and use it - in my mind there are not many things that are worse than not being able to find a toilet when you really need it - he was very grateful. Actually I have never come across people using parents rooms who shouldn't be apart from at sports grounds.

At AAMI park they have a strange parents room, and you often get drunk people in there wanting to use the loo, this one lady made all these kids wait so she could use it (mind you some of these were old enough to be using the normal toilets in my opinion (but toilets at sports stadiums can be very dirty/tricky so fair enough maybe) - I tried to explain to her it was a parents room but she was too drunk to understand. They also have a dumb set up where two identical cubicles, one is a toilet, one is a feeding booth, have never seen anyone feed in there (always just sit other side) but so many parents/kids queue up for the toilet thinking there is one in the booth (they should just put another toilet in there really).