[Biggles]

Thanks for all the input. It seems fairly conclusive after reading that link. I will continue to respect all naturally generated voltages and currents while working out and about. It's a good excuse to sit in the truck and read the paper anyway. Nowhere have I ever seen in our health and safety bumph at work any mention of the dangers from lightning. The danger of insect bites and too much sun (!), but not lightning. Maybe it's time to give them a nudge.
Alan.