Dave the AA do a kit with all the bumph ion for about £30, possibly through ebay but well worth it.
It includes the triangle,GB (or scouse , not English)sticker, other stuff but most importantly the stickers that go over your headlamps, that the bizzies will pull you on if you havent got them (deffo).
Make sure your co-driver says "give way to the left" on all roundabouts - this is the biggest one for me.
We drove to Sion years ago and is a good drive, but plan for swaps every four hours and you'll be ok.
The fuel is much, much cheaper in France than the UK, so fill up as much as you can in France (dunno about the Swiss, but would think that they are expensive, also).
Get some Euros for tolls, and Swiss money also, as the Swiss cain you on exchange rates for Euros, if paying that way.
No robbing trainees, or trackies - its not the eighties anymore.
See you for a bevvy with Stu when you get there, mate.:thup:
Fuel is pretty cheap in Switzerland, can't remember the exact prices but relative to everything else in the country it's a bargain!
We've got a family place in Lake Como, about a 15 minute drive from the Swiss border - as you go across the first 4 signs of life a petrol stations next to each other! The Italians all make the trip over to fill up.