Ok, firtly I haven't actually done this, I have just been talking to DH about it.
I said if the children were asleep and I needed to pop into the newsagents and was parked outside teh shop I would consider leaving them in the car, I remember this happening all the time when I was a child. DH was outraged! He said someone doing that would risk getting their children taken away from them by social servies and it's not the same as it was in the 80's when we were children
what do you think?