In reply to Rob Johnson:
yeah, been doing a lot of thinking about that but not come up with anything worth while yet.
our heads move too much when climbing for helmet mounted to produce much good footage and we're too close to the rock for the chesty to be any use. (although i'm going to try using the cheststrap on my back with the camera facing down next time)
for guiding / leading, i wonder if you could fix the camera to a rock somewhere close by with a mini tripod and bit of gear holding it in place while you bring your seconds up?