Well that was a deeply disturbing hour of television.
BBC’s amiable Rent-a-Doc Michael Mosley was given unprecedented access to the UK’s most secret and controversial weapons facility. Porton Down in Wiltshire was established in WWI as a response to the gas attacks the Germans launched in the trenches. Scientists based there had to work very quickly to develop gas masks for the troops and began testing ways to launch similar gas attacks against the Germans. Because the best defence is a good offence, and a cataclysmic scaling up of hostilities always ends well.