I dunno, it's a weird fade in, her voice and the background sounds(i'm assuming was the original piece) don't sit well with the drums, there's awfully well timed drums for being from cut up tape, and awfully good sounding percussion based on white noise and sine waves for the 60s and not having access to synthesiers in their workshop at the time, and awfully good low and high end content considering that it's from the 60s and the tape's 40 years old...probably not a wind up but i'm assuming that maybe in the early 90s or something, someone was working on a track with hers on top of it, it was put onto tape, labelled delia derbyshire etc.....i dunno, haha.