Our local council award blue badges only if you are receiving high rate mobility allowance, proving that you need a significantly high level of support to be mobile, or you are unable to walk more than a few feet unaided. My dd is entitled due to her severe autism, she can become overwhelmed at the drop of a hat due to sensory difficulties, some of which are hard to predict, so difficult to avoid.
She has no sense of danger, so it's more than possible she could do a runner across the car park, into the path of moving cars, it's also possible that I could catch up to her and she will drop to the ground, completely blocking the road and causing mayhem. It's also a common occurance that she has to leave, like, NOW, so we have to be able to hurry back to the car pronto before she has a complete meltdown and starts attacking me, screaming, dropping to the floor and becoming incredibly distressed. She can be a danger to herself and others at the drop of a hat, and thus she is entitled to her mobility allowance, and her blue badge.
I wouldn't DREAM of using the badge when she isn't with me, simply because it pisses me off so much when I can't access disabled spaces when we need them, it's those people we need to clamp down on, not the genuinely disabled, who seem to be getting pitched against each other in this stupid article.