From: Ted.Harding@nessie.mcc.ac.uk
You may well have a case, since there is implicit copyright on any "original work". However, the fact that you made it available without explicit restriction on your website could (but by no means necessarily) weaken your claim: basically, naively but unwisely, you left it up for grabs. Copyright normally extends also to "electronic" duplication these days. For the legal aspects of this, you need proper advice, however, since it's a can of worms.
I spoke to a photographer friend of mine about this a few minutes after Martyn sent it to the list (the guy takes photos for advertising, exactly the area that this covers), basically he has a claim for copyright infringement but he will have to pursue it directly with them. I also replied to Martyn offlist as putting information into a public forum about this may prejudice any action Martyn takes.
One other point is that the proper forum for this would be alug-social (unless the photo was of some linux computers in the original photo ;))
Adam