In reply to Mick B:
https://www.campingchamonix.com/en/home/
This place. Awesome owners, really chilled, nice facilities including a lounge for when it's pissing it down for the fifth day in a row and you're bored of your tent. Fresh bread available every morning, a pizza van twice a week and in a beautiful place for just heading out and walking.
And the walk back from Chamonix when you've missed the last bus is really quite nice.