This is a shortened version of the BBC Inside out documentary series that was first broadcast on 6th November 2006. Its interesting to note that this broadcast can no longer by found in the BBC archives, which I think is actually a breach of their own charter. Between 1953 and 1964 top secret trials were carried out using a chemical concoction of zinc cadmium sulphide to simulate how a cloud would disperse biological agents. The unsuspecting population in the East of England was sprayed covertly with the poisonous compound. This is an educational not for profit production. Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for fair use for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favour of fair use.