I agree Giles. Winchester is also so blocked with traffic that at least speed will not often be achieved!. We had the same issue with my Father who was strongly independent and proud as a pilot. We watched him go the wrong side of a junction one day and decided we had to stop things.
In the end we got him to agree to the outcome of an assessment by an advanced driving instructor. The instructor cut him down to day time and short journeys with a review the following year, which he failed.
