I have been with a number of tour companies, but the one I would recommend is Snowcoach, www.snowcoach.co.uk/
I have no idea how they are going to be after Covid, but they have been the most value for money firm I have been with and they also offer things that I have not found elsewhere. I got my skiing in with them the week before everything closed down last year and I would have been going in a couple of weeks this year if not for the pandemic.
They had some problems, years ago now, I think because they expanded too much. They have contracted into two hotels which they own, in Valmeinier and St. Gervais. The hotels are totally about skiing and have enthusiastic kids running them. They offer guided skiing and, although I have not been at half term for a while now, a children's crèche (though you had better ask about that if you are interested). They can deal with your lift passes, ski gear, apres ski and stuff. If you are solo, the guided skiing and the big communal dining tables are an excellent way to get to know other skiers.
Their major means of travel is, as the name suggests on a coach. but you can fly or self drive if you want. For me coaching only costs £200 and the best bit --- you ski two extra days over flying, as well as being SO much less palaver!
I drive down to Watford where Snowcoach is based, Friday pm, and leave my car there, sling my gear on the coach, relax and sleep on the coach, usually arriving at the resort 9am for breakfast and be skiing by 10 to 11am.
I can recommend Valmeinier for beginners because the ski schools meet up right outside the hotel and there is a wide slope, not too steep to learn on.
Good skiing!