To whom do the legs belong?

 

Along the Iron Age walkway on Cutting AXV in 1979. You can see quite how steep the modern angle of the rampart remains is here by the way the two spectators are standing. I know whose the legs are only because I wrote the answer on the back of the photo all those years ago. But can any of my readers figure out whose legs appear? Modest prize at the reunion for the correct answers ...