Film critic Lisa Nesselson tells us about two movies competing for the top prize at Cannes: "Cold War", by UK-based Polish director Pawel Pawlikowski, and "Sorry Angel", the latest film from French writer-director Christophe Honoré. She also tells us about another section of the festival, International Critics' Week, where she saw a French film, "Sauvage", by director Camille Vidal-Naquet.