Ah, now this is a classic example of Gabriel song writing/timescales!
It was co-written with Karl Wallanger in 1991 as part of one of the Real World Studio "recording weeks" but was never finished until 2003!
To answer your question, it is available on the 2003 compilation album, "HIT".
An alternative version of the track was released as single in November 2003 but failed to chart I think
An instrumental version of BYUBYD also appeared on a promo CD for the album (which also featured instrumental versions of Big Time, More than This, Secret World, Signal to Noise and a new track, Wild).
Sorry, getting carried away there...
Send me a PM with your address if you'd like to hear it.