This is an extraordinarily detailed dramatised look at the operations of the RAF's World War II command-and-control centre in 1944.
Despite its nondescript name, "The Scope and Purpose of the Filter Room", the dramatisation follows a "day in the life" of the Fighter Control Section plotting room (Filter Room) which collated, sorted and presented tactical information relayed from the Chain Home radar stations, the Royal Observer Corps, Air Wardens and combat air patrols.
The film also reveals the extensive role played by WAAF (Women's Auxiliary Air Force) personnel in this crucial operation.