OK, it's done
It didn't take a fraction of the time I thought it would, but that might have something to do with our new server that we're putting in at the moment that's 4x quicker than the last one
I've added a box to each category in the gallery, not the archive, and although it looks small, it can take quite a bit of info...although it'll all sit on one line, rather than in several lines like the old gallery.
Stu