OK I will just put i my 2p worth about Serre Chevalier and their creche. DON'T DO IT
Sorry we went a few years ago, the first time with our kids and they were nearly 3 and nearly 5. Firstly the creche ASSURED me they spoke english to the kids, they never did. My kids were left alone, couldn't ask for the toliet or anything, and the eldest had to wear a bib to eat with (She was most indignant! ) The ski instructers also never spoke english and shouted loads (I did watch and see this myself) after 3 days my kids were so upset they refused to go back - and these are kids used to childcare. They cried and cried and wouldn't hear of it again. We ended up taking them up the mountain and I taught dd1 a little by skiing between my legs. They were used to skis as we had done 3 or 4 dry ski slopes practice tpoo!!
However this all may be tainted as it was the worst holiday of my life, DH broke his shoulder on day 3, My MIL came and was a vile bitch, teh kids were miserable and hated it and I was so upset.
IT nearly scarred my kids for life!!
We go with ski-eaprit and although it is a little more, it is so much better everyone gets a proper holiday. BY the time you have your £1400, and add food petrol etc, you will easily spend another £600 anyway. At least with Esprit once we get there we spend less than £200 for spending money (we take from the breakfast table for lunch!!)
Honestly the kids can go to spritelets or nursery where they all speak english and will be on site. Wait a week or two and the accommadation will be cheaper.
The extra couple of hundred will be worth it seriously local creches are no fun if they don't speak English the kids end up very bewildered and miserable.
The only place I might suggest is Vaujany as I belive there are at least 2 english nannies working in the local crech as most of the clients are from Ski Peak. (IIRC)