BBC documentary about Hadrian's Wall (identifying music at 05:25)

There is an episode of timewatch about Hadrian's Wall. This is a documantary from the BBC. At 05.25 there starts a beautiful track and I would like to know if anyone recognizes this music. I tried identifying it with Shazam but that did not work. Link below.

http://www.youtube.com/watch?v=uUNk3qQTJ1Q