Desert Dingo,
Thanks for that info re the changes to the flight plan. Although I've read Impact Erebus and Verdict on Erebus, I was unaware of the details leading up to the change of waypoints.
By the way, I've got the original "Today" program on the accident with live footage of the Royal Commission on DVD if any one is interested. It was taken from an old CVR tape so some of it is a wee bit strained but generally okay.