Steve and Chirone,
you are both right on all points, the mesh is pretty low poly, and am using the smooth preview for now til the body is done and heading into ZB, I've already taken a smoothed version into ZB to test it out and it's reacting really nicely, all the loops are in the right places (just about, a couple need tweaking) making it feel really nice to sculpt on!

Will post a smoothed wireframe at some point in a while.