For example, as of this writing, the images in that thread are not working:http://forum.bongofish.co.uk/index.php?topic=1169.0
It is though the file is not present on disk.
My guess is: this thread was moved but the images did not "follow"(?). There is a lot images in that situation it seems. One way to discover them all is to use a Google query:http://www.google.com/search?hl=en&q=site:forum.bongofish.co.uk+"(0+kb"