When the Russian leaders came to Oxford in 1956, as described by Michael Tunstall, (Oxford Today, Trinity 2013) I photographed them on the steps of the Sheldonian from the Blackwell’s side of the Broad.

It only occurred to me later that I could easily have changed the course of history. I was using a telephoto lens on my Leica, with a pistol grip, and could easily have been an assassin as far as their bodyguards had been concerned if they had spotted me. A few months later, and in almost exactly the same location, I photographed the anti-Suez protest march.