I first heard this song at the end of the London 2012 Olympics on the BBC as a closing summary full of highlight memories - [playout sequence clip] to jog your memory.
The song is a unique collaboration between Thea Gilmore & Sandy Denny. In late 2010 Thea Gilmore was commissioned by Sandy Denny’s estate, in conjunction with Island Records, to write melodies for unfinished manuscripts, lyrics without music, and works in progress (that had come to light in 1989) to finally bring some of Sandy Denny’s last works to the world. Of course this song is not about the Olympics but just being away from home.

The 2012 Olympic playout was just an edit, this is the full track called > 'London'