In reply to steveb2006:
You'd probably get away with 50m ropes as there are usually a couple of abseil points. It would be easier to have 60m so you don't have to do short intermediate abs to get between these, and do you don't accidentally end up dangling as mentioned.
There are two sections of mixed on Lillaz Gully, the lower section took a couple of nuts and the top section was pretty iced up and protected by screws. We took cams and hexes but I can't remember using them. Also took bulldogs but didn't use those either.
Have a good trip and I hope you get good ice!
David