From Sefton Bivvy

Head up the rib behind the bivvy to where a broad bench runs across the top of the Huddleston Glacier. Negotiate your way into the upper Huddleston, from where you have two options:
(i) Continue up onto the Main Divide ridgeline left of Tuckett Col, and along to where the north-east ridge steepens. Traverse across a short section of broken, rocky ground on the face to rejoin the snow that leads into the upper Shelf.
(ii) Cross the prominent spur that bisects the Huddleston and Tuckett Glaciers at about 2500m, and continue traversing, angling towards the uppermost icefall that feeds the Tuckett Glacier. Once at the point between the rock band and the icefall, head up the true-right of the icefall (which is relatively protected from this point) and over the rib into the upper Shelf.
Then take one of the routes from the Shelf Glacier to the summit.