site:vbulletin.com = 2 links, and neither of them are actual vbulletin pages.
site:phpbb.com = 0 links.
So, I'm not an expert on google.co.uk, so that seems like something not just related to UBB.threads.
Ok, so maybe it's just a uk thing and it will only show domains that end in .uk? Not sure. If that's not the case, and it was indexing them before, then it would seem Ian would at least have some old links in there.
Edit:
And that surely seems to be the case. On that same page, do this:
Same site, different top level domain. Since Ian's domain ends in .com and not .co.uk, that's probably why he has 0 links.
What I'm getting at basically by my original statement, of mass hysteria, is some things get said that people feed off of, but doing a bit of investigation shows that it's not really something related to UBB.threads.