The information I will give you applies to Northern Ireland, and I don't know about other areas of the UK. for my disability badge, I downloaded a form from the website of the DVLA (Driving and Vehicle Licensing Authority). I filled it in, and asked my GP to sign it, which she did. Then it was sent to the DVLA and the badge was issued in about six weeks. It has to be renewed every three years, but that is just a formality. The final say is really with your doctor. I hope this helps. good luck, your Mum should really have a blue badge, it would be a great help to her.