When you say driving assessment, do you mean a normal driving test or a short theory test?
After my dad passed away at 86 years old, driving my mum around she told me about how bad his driving was, going up kerbs because he cut the corner too much, reversing into a 200 year old oak tree that appeared from no where, I actually saw the evidence of that as you can imagine the tree damage was.... well what tree damage, as for the rear of the Subaru, not pretty.
Also he certainly was not a 40mph everywhere kind of person either, he would be trying to out run the yoots in their Saxo's on the main roads.
Oops, going on a bit here.
Anyway my dad needed his license taken away. It would have only be a matter of time i feel before he caused someone serious injury.