Delia Derbyshire created the electronic soundtrack for the 32-minute film "Circle of Light: The Photography of Pamela Bone" (1972) directed by Anthony Roland, which won in the Short Film Art Section of the Cork Film Festival held 10-17th June 1972. The music is a gentle half hour of real and electronic seascapes and birdsong on a evolving background of shaped noise, introduced and signed off by variants of the "lampshade" sound used in Blue Veils and Golden Sands.  The accompanying film is a sequence of wobbly zooms and pans on bleak seaside and woodland photographs, some of them beautiful.  This is the longest surviving single piece of Delia's music and from late in her musical career.  Elsa Stansfield is also credited for the music but it is unclear what she contributed to it. (Wikipedia)