Well I've now found my original recording of the whole Colin Faver show from that night in '91 and it does include the beginning, and the end with voiceover. You haven't missed much, the intro is just beats. I'll get it ripped to MP3 soon and put it online.
With regards to re-recording, I've dusted off an old controller keyboard and started playing about in Reason. Compositionally its easy to re-arrange, but I haven't found the siren sample, or a good bass that sounds like the main. I'll keep hunting though and see what happens.