Well, we had our first downpour of snow overnight (about 3 inches), and my drive to work this morning in the GTI was, well shall we say entertaining. The main roads had been gritted by our council, but on our estate and the non major ones weren't, and my 19" Alloys with Pirelli P Zeros didn't like it one bit. Many times when trying to start off with as light a throttle as possible (DSG box in Manual), the wheels just spun and the nose of car went from side to side before it gained a bit of traction. The Pirelli's certainly don't like ice one little bit.
It also amazed me how fast some other road users were travelling at when it was clear to see the road underneath us was sheet ice.
I now definitely see the advantages of having a set of winter wheels and tyres for the car, and need to investigate urgent if this weather continues (but of course this is the wrong time of the year (price wise) to but winter wheels/ tyres) !