Which edition is that? I'm guessing the original UK one.
Yes, it's the original UK edition from 1989.
The only other CD I have had turn bronze like this is Tony's Soundtracks which is inscribed on the disc's center with "Made in UK by PDO." Through online research, I found that it's common for discs manufactured in the UK by PDO between 1988 - 1993 to have this problem. Smallcreep's Day, though, does not say made in UK by PDO.
The funny thing is, Soundtracks turned bronze more than 10 years ago but still plays fine. Even though I have all of Tony's releases, I rationalized buying the recent "Banks Vaults" box set partly as an excuse to have a better copy of Soundtracks.