All episodes of "Snow" by Marcus Sedgwick are available....

...on BBC IPlayer for the next 23-27 days.

Here're the links to all episodes beautifully read by Jonathan:
http://www.bbc.co.uk/programmes/b085t3f4
http://www.bbc.co.uk/programmes/b0868w4h
http://www.bbc.co.uk/programmes/b0868w9z
http://www.bbc.co.uk/programmes/b0868wkd
http://www.bbc.co.uk/programmes/b0868wnv