lynsandtone wrote:Hi, myself and some friends are going to climb Mt Blanc on the 25th September ...
Any advice would be greatly appreciated.
although I can't really satisfy your questions, I try to answer since nobody else does.
As for the blankets, phone Gouter hut
From Bellevue to Nid d'Aigle (end point of TMB) you have to calculate additional 600 m of altitude, most easily done along the tracks, I suppose.
A valuable source of information is also the Office de Haute Montagne, OHM
and write a nice TR in case of success!