Well researched, accurate and thoughtful film. The information was delivered in a calm and helpful way that will help anyone trying to find actual scientific and balanced view on this topic. The interviews were very helpful and from a variety of contributors. I was particularly shocked by the treatment of the woman who had worked at the London Fire Brigade. Yet she was thoughtful and honest about her treatment. Many if the biological facts explained were obviously very basic but these need to reiterated in a world that increasingly sidelines biology taught across the world to everyone. This programme is a must watch.