Hi Andain!
I guess you could find the full interview if get you the Meeting People is Easy rockumentary?
http://en.wikipedia.org/wiki/Meeting_People_Is_Easy
even wikipedia doesn't know about the song in the background:
"Several unidentified brief instrumental keyboard pieces are heard in the background during the film. Some[who?] have noted a possible similarity between one of these and the song "Sit Down. Stand Up." on the band's 2003 album Hail to the Thief."
i bet its an early demo for Sit Down Stand Up. it sounds so eerie.