The GPO Film Unit-50 years old this year-went where no Hollywood film studio would dare to go in 1933. Down the mines, across the Alps, through the storms of the North Sea ... they really were a dedicated and intrepid group ot film makers. Held together by a dour and dynamic Scot, John Gnerson— the man who first coined the word documentary-they made some of the greatest factual films of the 1930s which still provide a fascinating insight into the everyday life of the time. Tonight Arena tells the story of this remarkable period of British cinema.