PIP Re-Assessment Query on Driving

Hi all, my husband has just had his re-assessment form for PIP. He had his licence revoked a few years ago due to meds, but is now driving again. He suffers from Parkinsons, but is able to drive OK at the moment. When he got his initial form, he was using buses, so I'm wondering if he's obliged to let them know he's driving now, or if he can just tick "No change", as he does still need help from me in unfamiliar surroundings when he's in the car.

Thank you Gordon. I was a little concerned that if, he drives to a medical assessment (I cannot drive), he may be penalised for it in some way by not letting them know, but we'll omit it from the form.