I've plotted the waypoints in GoogleMaps. It seems that the map is offset about about 150ft north of the actual points (note the difference between the picture of the road and the GPS measurement of the road.
Arrows are where Google thinks the points are; circles are where I think the points actually lie. Red dots are where I think we walked, green dots are where I think we climbed, and the blue box is where I think Burston's Crevasse lies.
In hind sight I think all the earlier pointers ("No Entry" - gulley - mushroom rock - fixed lines - recce Burston's beforehand) are infinitely more valuable than these waypoints.