In the sequel we've waited half a century to see, Mary Poppins has returned to the screen. The children she cared for in the 1964 original have grown, but their nanny is mostly unchanged, except she is played now by Emily Blunt. Anthony Mason talks with Blunt about bringing P.L. Travers' beloved, eccentric character back to life in a magical musical, and with director Rob Marshall about how he came to choose his "Into the Woods" star for the role.
