Music in Autumnwatch

[juliacornwal]

Simon King was doing a segment tonight about wild otters living in inland waterways. The filming was all done on night cameras and featured swans as well. Can anyone please tell me what was the piece of music they played during the showing of this segment?
The BBC used it quite extensively during the making of the television series Auschwitz and it always makes me think of the railway line going through the Death Gate at Birkenau, and the miles of barbed wire dotted with watch towers.