Dance has almost always moved freely across frontiers. Just as in the 19th century, Italian and French dancers went to Russia to make their names, so in the 20th century, Diaghilev reversed the flow by bringing the Ballets Russes to live and work in Western Europe. All part of the ebb and flow of dance. Margot Fonteyn visits Tchaikovsky's house near Moscow and talks to Marie Rambert about Diaghilev. The programme includes unique film of Pavlova, as well as Mikhal Baryshnikov dancing Petrushka