Created in 1933 out of the ashes of the Empire Marketing Board Film Unit, the GPO Film Unit was one of the most remarkable creative institutions that Britain has produced. A hotbed of creative energy and talent, it provided a spring board to many of the best-known and critically acclaimed figures in the British Documentary Movement, including John Grierson, Alberto Cavalcanti, Humphrey Jennings, Basil Wright, Harry Watt, Edgar Anstey and Arthur Elton, alongside innovators and experimentalists such as Len Lye and Norman McLaren. Their work embraced, public information drama-documentary, social reportage, animation, advertising and many points in between. The BFI National Archive, in partnership with the British Postal Heritage Museum, Royal Mail and British Telecom, has preserved and curated the legendary output of short films produced by the GPO Film Unit. This, the second of three volumes, represents the GPO Film Unit at its creative height - including much-loved classics such as Night Mail, the experimental animations of Len Lye and Norman McLaren, and Harry Watts' first forays into drama documentary with The Saving of Bill Blewitt and North Sea.