Hi Binky
If your current PIP award is ending and you have not heard anything from the DWP, it should be extended until your review takes place. However, I would ring them to confirm that will happen. Unfortunately, you won't be able to renew your Blue Badge until you have a new award letter. Some people have applied directly to their local council rather than waiting for their PIP review to take place. In terms of your car, you would need to contact Motability who decide what happens next.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems