The film begins with Captain Athelstan Popkess of Nottingham Police making a speech. We then see the ARP exercise involving fire engines, the rescue of 'victims', a burning building and a mock mustard gas attack from aircraft in which the rescuers don gas masks. A large crowd watches the exercise which takes place in Broad Marsh from behind a barrier. Water is sprayed from lorries to clear the gas contamination. The fire service douse flames using water pumped from a nearby canal.
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Captain Popkess (Athelstan Popkess) was the captain of Nottingham police force from 1929 until 1959.