>>Not every person who is disabled shows their disability<<
Agree with you there Dave.
I am not classed as disabled, but becuase of circulation and arthritus issues with my legs, I cannot walk very far and have great problems getting in and out of a car for the above reasons. Normal parking spaces create great difficulties for me.
I go to the parking attendant and explain my situation and some let me park in a disabilty space and some don't.
However, I never park in a disabilty bay, without approval.
In fact I don't claim disabilty living allowance or unemployment benefits, unlike some bleeders of the system.

Basically, abide by the law and stop whinging. The world would be a better place.