this episode of the history hour is interesting but the section on the chemical warfare trials at porton down in the 1950s is disturbing listening.
I bring it to everyones attention as the whole subject of NBC defence and related items have been a personal interest for many years.
http://www.bbc.co.uk/podcasts/series/history (http://www.bbc.co.uk/podcasts/series/history)
the episode is about VE-Day and the item on porton down is about 23 minutes into the hour long programme.