There’s something very special that first really cold day of the year. When its minus 20 at the edge of nightfall and the light is fast slipping away. You stand with the wind at your back and still you feel the icy chill right through your clothes. The pale weak light of the afternoon gives way to an inky blackness and a swirl of snow and you begin to notice how fast the temperature’s dropping once again as it makes its way to minus 30.