Rest and acclimatisation at Base Camp. Temp dropped to -13c last night. A few people chilly in bed. Temp in tent a balmy -11c. Today the clear night led to sunny morning and the temp rapidly rose. Avalanches and rockfalls all around. There are definitely places where you don't want to be! Just done crampon practice and the sun has gone in. Tee shirt replaced with thermal top and down jacket immediately Big day tomorrow over French pass.