All I can find in my advice is:

If there is any likelihood of severe conditions where you live or where you have to travel, buy a separate set of wheels and fit full 'Winter Compound' tyres from November to March. These are at their best at temperatures below 8 degrees centigrade where standard summer tyres are severely compromised, traction is relatively poor and braking distances are hugely increased.

So what are you referring to? I might be looking at the wrong advice, but this is the latest.

HJ