Thanks all. That's good news. I was sure I'd read on here of someone having problems copying purchased items a second time to their H's iPod.
Now I just need to worry about which iTrip-type-device to buy....
Do I go for one which is powered by a cigarette lighter? but on long journeys I usually have my sat nav plugged in here.
Do I go for one which is powered by the iPod? But I'm guessing this won't last that long
Do I go for one which is battery powered? But again, I guess the batteries won't last that long.