"'The Black Room' is an unfinished collaboration between KLF and Extreme Noise Terror. The original style was to be played as hardcore techno, then industrial metal, before settling on metallic thrash composed and produced by KLF but performed by Extreme Noise Terror. The album was scheduled for release by the end of 1991, then pushed back to March 1992. The two bands were still recording in February 1992 when KLF scrapped the sessions altogether. Asked if the recordings would ever be released, Jim of KLF said: 'There is a bootleg flying around, I haven't heard it (to verify). I thought I had the only copy (of the original sessions), but I guess there might be another one that was made.'"
(But wait, there's MOAR!: https://selfishfew.blogspot.com/2019/09/extreme-noise-terror-cock-esp-split-5.html)