BBC Learning have a free download available.
The story is of a young teenager named Thomas "Tommo" Peaceful, who tells the story in account format from the past to the present day events of his experiences living in the village of Iddesleigh during World War I.
Private Peaceful by Michael Morpurgo
It is in 13 parts, each downloadable as MP3.
It is due to removal on 26-May 2014.