A few years ago, I was caught in a snow storm near Ribblehead in my Ed30...
It was on normal summer tyres. I could not take the normal route back to Ingleton, the hill was iced up... I had to go through Horton-in-Ribblesdale (hardly ideal)... but with anticipation I made it home. At one point, I passed a BMW X5 on a hill, spinning its wheels - I didn't stop or I'd have been in the same situation... I made it home, eventually, the biggest issue was a downhill stretch to a T-junction...
4 wheel drive might help you get going but it will not help you stop.
The appropriate tyres are key... my mate's 2WD Skoda Felicia Rally Car with snow tyres on will go places in the snow that he can't get to in his road-tyre shod VW Touareg...