I'll just preface this by saying that I have a child with some disabilities that affect her mobility. I've not applied for a BB because I don't think she'd reliably meet the criteria, though we do normally park in P&C spaces/the closest we can get/get my husband to drop us off and he parks and joins us.
I'm wondering though if I'm being too literal about the criteria. Putting aside for now those in a wheelchair, the mobility criteria seems to be that the person can walk less than 50m or that it's difficult or impossible to walk. Obviously it's a bit more nuanced than that, but that seems to be a summary.
But take a large supermarket for example, some of the BB parking spaces themselves are more than 50m from the entrance, and my Tesco (looking at Google maps) some of the BB spaces are 100m away and the store is about 100x50m. Even in a local co-op, you'd walk more than 50m from the entrance, down the aisles, paying and then back to the exit, even if parked right outside.
So in my mind, if mobility is tricky enough to satisfy the BB criteria, that Tesco store would probably be impossible anyway. I'm clearly missing something here though.
In lots of places, the BB spaces are further from the 'venue' then the criteria for a BB would allow.
We recently got an access card for my child, and she got the <50m symbol awarded, but I feel awkward about that. She has issues with fatigue and balance as a result of a serious medical condition, and whilst often can run around a park with friends, has a back up pushchair for when she's tired, needs to be carried a lot etc. There are times I carry her to the toilet because she's too tired, and definitely times when 50m is insurmountable.
Maybe I'm being too literal in my interpretation? Perhaps I should apply for one for her? I don't know.