So really, this is a UK-only application?
Cost-wise, how does the laptop + GPS + MapPoint solution compare to one of the modern GPS guidance solutions or one of the PDA + GPS solutions.
Having just spent three weeks in the UK I've seen a number of such variations. Maybe its just my extended family but they seem more popular over there
It strikes me that the PDA solution would be more convenient and cost effective. They also come with frequent updates. But the re-routing seemed to take a while (perhaps a minute) for the Garmin that I watched for 100+miles. (local knowledge can help often results in changes from the suggested route).
Richard