Someone I know today was moaning about an "old biddy" who had parked in a P&C space because there were no disabled spaces left. Now I actually have a blue badge for my DS who has no sense of danger but I only use it in car parks where we can't park near a footpath. If we can park near a footpath in a normal space then I will park there and put reins on him or hold his hand.
I just think it's a shame that people would rather an elderley person or disabled person struggle than offer them their P&C space!