RoSPA (The Royal Society for the Prevention of Accidents) has a useful page on Winter driving.
Driving in the winter is very different than in other times of the year. Adverse weather and longer periods of darkness (especially after the clocks go back at the end of October) makes driving more hazardous. Sometimes conditions can be extreme, as we have found out over the last two winters in particular, with prolonged periods of heavy snow and floods.
This means that we need to adapt the way we drive.