I found this heard this track for the first time yesterday and I must have listened to it about 20/30 times already. It's from the 1969 The White Noise - Electric Storm LP. To me it sounds 30 years ahead of it's time. I made a fairly rudimentary video for it. I hope you like it.
Delia Derbyshire is well known for her work with the BBC Radiophonic Workshop and her help in creating the Dr.Who theme. Of all the BBC Radiophonic musicians I've heard I always found Delia's music to be more aesthetically mature than that of the others. While many were content to create mathematically structured enharmonic noise she looked for the ghost in the machine, creating haunting, off kilter and often sexually charged music.
If you want to read more:
Reel To Reel Beatmatching
Just to show a little of Delia at work. This clip is from the BBC documentary on the Radiophonic Workshop "Alchemists Of Sound."
That is severly cool... A 4 deck mix on Reel-to-Reel :)