I've read the posts here with interest and I like many others have also been trying to hunt down this version of the track.
Here's my view on the track...
I think it's an early demo of the Euphorically Mix rather than a special edit.. If you hear the mix of the Radio 1 Hot Mix it finishes very abruptly with some explosions rather than an outro that he mixes in to the next tune.... This may point to an unfinished demo, although I never heard him play it live so maybe there was a more complete version?
The drums are definitely from the Euphorically Mix as is the main organ riff... hence my view is it an early mix of that version.
I think the "Can't You See I'm Gonna Fall" vocal is the original vocal Rollo/Rob D used on the track rather than added by Sasha either live or for an acetate that he may have cut..
I think they either changed the vocal before they went to FFRR or FFRR said "great tune but we need a better vocal hook" and they had a session singer in to sing a few lines.
As it happens I've message Rob D tonight to see if he can recall what version this is and hopefully end the mystery