How relevant it might be in this instance I’m not sure but… As much as certain conditions are notifiable you can also be assessed for you fitness to drive in light of a condition. The NHS have driver assessment centres, I had to go to one at the beginning of the year when some nerve trouble was effecting my movement/sensation in my legs and feet
The assessment is quite interesting – a bit of a catch-all because you could be referred for all sorts of reasons – so you have eye tests, reaction tests, memory tests, perception, spacial awareness, reasoning, counting backwards from 143 in 7s, I was even asked what day it was….. and got it wrong. You have a physical, your reaction speeds and hand/foot strengths are tested in a driving simulator, then you get a driving test in a controlled environment and finally another on the road.
I didn’t have to prove any of these things to get a licence so its quite startling to have to such scrutiny in order to keep it.
Anyway the point of the exercise is to get an valid, expert, measured test of your fitness to drive and for decisions about whether you can remain licensed and insured based on that rather and the DVLA and insurers notified accordingly.