Flies are dangerous, disease-spreading pests which must be eradicated at all costs, warns this public health film produced for Bermondsey Borough Council. The level of vitriol is such that you could almost feel sorry for the humble fly - but at a time when disease outbreaks could be deadly, especially for children, public health came first. Simple precautions could make a big difference, and the cinema was an ideal way to disseminate this information to mass audiences.