Micraman
Thats a very reasonable question. Unfortunately it is sometimes difficult to get a reasonable answer.
There are no hard and fast rules and it depends very much on where you are, what you are required to do, and who pays the bills.
If I am going to send someone out in my helicopter, in the snow, then I will make sure he is capable. If he is not, or if there is doubt, I have two options:
1. Wait for the snow to clear.
2. Give him some training.
Either way it is going to cost money.
I can't think of any responsible operator who will allow their pilots to experiment in the snow without guidance.
I'd take the British Army method every time, unfortunately, as a civvy I now have to have a slightly different outlook.
Tam Macklin