In reply to Samuel J:
Hi,
Just back from chamonix, had a good time and managed a couple of wild camps.
I asked at the mountain guides office re bivvying/ small tent in the aiguille rogue area. They said whilst general camping isn't allowed bivvying/ small tents are fine as long you put the tent up after 19hrs and put the tent down by 9am.
In terms of location we found that lac blanc was too busy and too close to the hut so continued on to lacs de cheserys. At the first lake near to the path there were other people camping, we continued and found a great spot at the lakes which are set back from the main path but really great spot.
It was a good trip and plenty of places where you can put up a small tent out of the way.
Just one word of caution, not to put you off, but keep an eye out for ticks, managed to get bitten by something somewhere in the valley, apparently they are prevelant, just like the lakes I guess, not to put you off just to be aware.
Have a good trip!