Mmmm, BBB - the finner points of running. Good point. I find fins aren't too useful when I run, although I understand a large dorsal fin can be very attractive in the mature runner.
JJ - yes, the knee held out. I've only ever had problems with my right knee, and after a trip to the podiatrist and with the aid of a knee tubey thing, I'm coming back slowly. Saturday's run was fantastic, and I couldn't believe it when I say THREE herons on the towpath.