Living near Beaconsfield and working at Heathrow, I've not had too many problems in the last few years with snow. My Aero estate (on Conti SC2s at the moment) has been OK driven sensibly and with anticipation (no sudden inputs to throttle, brakes or steering, and keepng the speed down) in fresh snow, and the A40/M40/M4 are well-salted, so usually just dirty and slushy. My only problem comes with the (not too steep) hill to get up to the A40, which is unsalted and quickly turns to packed, polished snow with scarcely more grip than ice (I take another route when that happens). Do winter tyres, or indeed full M&S tyres, help in that situation?
BOF