I got a reply from someone in Maria Miller's office.
It was the most long-winded non-reply to my questions that I have had yet! Sadly, I do not need an email explaining to me the criteria for a pre-school child needing a Blue Badge. My Daisy is 8. I said this in my opening paragraph. Nor do I need an email explaining how DLA and the Motability aspect work. I ALREADY KNOW!! I appreciate that higher rate DLA and Motability is for those with severely restricted mobility....but, as I explained in MY email, we are housebound without my car. My car works. It works fine. If I lost my car (through no fault of my own) we would be housebound. How much more restricted is there? I don't want to change my car, I don't need to, I just want the "safety net" of Motability IF I need it. Having it there cost nothing to anyone, but it gives me the peace of mind that no amount of money can buy.
I am really rather annoyed about it, and I'm not going to shut up and go away and go away until I get somewhere with this. Stay tuned.....!