I went on a school holiday around the same time as you (Tuc1), only I stayed at Jura Rosaly, a large house nearby. There is a website up and running now and the house is still being used for group holidays.
I have fond memories of this time. We spent 6 weeks on our educational holiday, in the summer. I went to Kilburn Park Junior School in Brent. (It's not there now!)
I particularly enjoyed the morning hot chocolate drink at breakfast and the bread and chocolate we were given on our walks through the mountains. Our walks took in a local village, the name of which I can't remember, and we met up with other schoolchildren from nearby La Bessonaz.
I also remember the air being very thin, and I experienced breathing problems on most of the walks.
Oh, those were the days. Thanks for bringing the happy memories flooding back.