In reply to Jon Massey:
Its about half an hour from the village as I remember, a bit longer from the boat as you've got to get up to plateau level first. Navigating is easy if you follow the big path up the east side to the correct wall, then cut straight across and follow the cliff-edge path on the west side - the top of the slide is fairly distinctive, especially since it comes all the way up to plateau level.
I'm pretty sure the route took us not that long - one long pitch from the bottom up to the big boulder which is the obvious abseil point (it does just about go in a ropelength, but its a full length, you'll have centimetres rather than metres left on a 50m rope), then a pitch up the groove, then the traverse pitch, then a scramble out the top.
Enjoy it, its a nice route, although there were others at VS and below which I enjoyed more on the island............
AJM