That's it. I've gone and done it. I've got a Gravatar now.
Problem is, I so don't want it...
Second problem is, they don't tell you that it's automatic, and looked I have, but they don't tell you HOW TO REMOVE IT.
Anybody out there know how to do that?
Update - 12 Apr. around 9:30am
AH AH. They're aces at Gravatar. Apparently, you just have to remove your e-mail address, which I did the first time round, but there was evidently a problem with it, and the site threatened to call the FBI. I kid you not.
But now it's worked. And I suspect Tom thinks I'm the biggest brain-dead moron the earth has ever borne. That's OK. Gravatar has gone.