About 40 years ago, the gate was closed on a garden in Suffolk that had been a magnet for a certain kind of person: if you were an artist, poet, flaneur, composer, or freewheeling gardener or cook, you may have found yourself sitting around the dining room table at a rather unusual art school called Benton End. It was run by two urbane men, former stars of the art world in London and Paris, Arthur Lett-Haines (“Lett”) and Cedric Morris.