agree that DVLA are no good for advice, I am still driving from my chair and I got advice from a regional driving centre where they sorted out what adaptions I need. I was told to include what effects your driving (eyesisht, ability to control pedals etc.. and have to drive an automatic, and in my case left hand break and accelerate.
If your situation is not as severe and the consultant/GP thinks you are safe to drive, and you feel safe as well, then tell then nothing and do not complicate your life! I would ask you GP ( if they are fully human) and get advice from them first.
