Britain's Second World War victory depended as much on assembly lines as on frontlines, and this feature-length compilation from the War Factories series tracks the industrial effort that kept the RAF and army supplied. It moves through the plants that built the Vickers Wellington bomber and the Avro Lancaster, following the shift from peacetime manufacturing to round-the-clock war production. Archival footage shows factory floors reconfigured for tank hulls, aircraft fuselages, and munitions, while the narration lays out the logistics of scaling output under bombing raids and material shortages. Particular attention goes to the workers themselves, including the women who filled the labor gap left by men sent to fight, taking on skilled engineering roles for the first time. The film treats production as its own front, arguing that German bombing campaigns aimed at British industry failed partly because factories dispersed, adapted, and kept running. It is a straightforward account built from period footage and expert narration, more interested in rivets and output figures than in generals and battles.