WOW! You are correct. As always, "adapt and overcome"; you followed the instructions...

so just say what happened. Finding a mirror site for FOLDOC (via Google or some other means) is even better. Something must be wrong with the server at Imperial College. You can still answer the question, by looking at the URL

("wombat.doc.ic.ac.uk")

even though you can't access the site. However, if you report the location of a mirror site the answer will be different; I will not know that unless you give the URL.

Since Imperial College and it's FOLDOC are such major players, I'd expect it to be back up soon. I'm amazed it has been down as long as you say.