I have the 2 versions of this song, one is called Jamie's Theme and the other is Jane's Song.
Both are almost the same music, but with some diferent entries and the tone is a bit diferent too.
I truly belive that this demos pieces are the Trois Gymnopedies Movement Nr.1 from Erik Satie that John Foxx played.
Is very interesting and probably unknow but this song is very revolucionary, because is a precursor to modern ambient music.
Gary Numan made a cover in the same year, but he used the first and the second movements, but Jonh only made the first. Probably this is a moment that John Foxx and Gary Numan was together.