In reply to Milesy:
Skiing makes for a nice rest day and you get some awesome views from the higher lifts. If you fancy some skiing - I've been to Pila close to Cogne which was OK and does have a higher lift with some good views. Cervinia (when we stayed up that way) was a lot better but is a bit of a trip from Cogne - it does have some really high lifts though and great views of the matterhorn.
Regarding grade there are quite a few WI2's so that's about Scottish 3 although as ever with ice nothing is certain grade wise and I've done WI3 with hard Scottish tech 5 climbing on it. Watch out for the averlanche danger. One side of the valleys tends to be worse than the other.
The ice in general is more brittle but its also generally more homogenous and thicker than uk ice. Overall it does tend to make the climbing a little more predictable so easier to grade push. Cascade de lillaz is a must do and there isn't often anything harder than tough Scottish IV on it. Super short walk in too. Leave out from the car park 20 mins before dawn and get to be first on the route
Our mistake was thinking a long WI3 would be easy on the first day and it wasn't. The grading was out by atleast a + and the measured length was in vertical metres we think as the route was much longer. The route took much longer than it should and all that easy ground on water ice is very hard on the calves and we were both knackered and very sore the next day.
Enjoy the trip it should be fun
Post edited at 08:53