My first BB is due for renewal in October, when I applied I had to do the form as normal and then had to be seen by a doctor who was not mine in a nearby town 5 miles away, I knew it was going to be difficult so parked as close as I could and went in very slowly, I was made aware by a friend that the place is littered with CCTV so I was extra careful. The Doc could see it was difficult for me and instead of going to his office I refused and he had to do it in the waiting room, the criteria around here seems that if you can walk unaided 100 yards then you do not need a badge, obviously, there are other reasons a for a badge but I cannot speak to those.
I can on a good day zip around the supermarket, but I have to move fast as I can before the pain kicks in, 5 minutes at the most then I'm done and need to sit for a good while before I dare move again.
I also think we should be given a blue badge to carry with us as a long queue can be very painful for mobility sufferers but we have to stand with everyone else, or perhaps in a supermarket grab an assistant and get them to open one of the many unmanned tills, places seem to think if they put in a ramp then they've done, no, there is more that can be done.