At the risk of reviving this thread, just a report on the Goodyears we fitted a while back, in the icy conditions recently.
We had to go across to the east coast last Friday, when we thought it was rather warmer than it has been of late. The journey involved 45 or miles of single-track. We got to once point, and turned a corner, and I felt the car lurch slightly. It was very controlled, but clearly we had slipped on black ice. I tried braking and accelerating, not hard, but hard enough to find break points, and the car behaved perfectly. Just from time to time, there was a lateral loss of grip.
We picked up a 4x4 of some kind ahead of us who carefully drove along at 25mph, and porkily tried their brakes very early when approaching a corner (we could see the brake lights going on and off) so I must assume that they were feeling much more at risk than we were.
Our own roads here have not been gritted for some time, as the 2 local gritters are both broken. Again, this morning, we had a couple of occasions of lateral grip loss, but in a straight line no such problem at all. These lateral slides also felt even; it wasn't the back stepping out or the front washing away, but a definite lateral movement.
I can't tell if this is an aspect of the MG4, perhaps its weight distribution, or it's rear wheel drive, as it's decades since last I drove a rear wheel drive car, or a factor of the tyres. But it's a very specific movement.
So I would say the snow holds no fears when it comes.