But yours is a non-turbo Rich?
I was thinking of Hobnobs. I thought early turbos would have had just TC and later ones the full ESP. Talking of ESP, it got me out of a bit of a pickle when I hit some ice today on an off camber S bend. Just as i started a mini tank slapper, it all tidied itself up, which was nice as a truck was coming the other way.
Going back to the original question re. snow and noise. If it is not TC, then i remember my old cars making an horrendous noise on snow. It was simply the noise from tyre slip on snow, just like tyres sometimes make an awful noise when turning in a showroom.