Experimental Dance Track
The 2008 web article Lost tapes of the Dr Who composer is accompanied by a "find" in Delia's Attic Tapes of what they call an "Experimental 'dance' track". I'm not sure what those single quotes are meant to suggest.
A reader on the net quickly identified it as the rhythm track of Dance from Noah but it is, in fact, a different piece constructed using the same rhythm track but with different melodic elements blended in.
Until we discover what it really is, for lack of another name, we'll call it Experimental Dance Track.
On the tape it's recorded on, Delia first says "Er... forget this. This is for interest only."
- Attached to the article Lost tapes of the BBC composer on BBC News web site