There is a documentary starting on BBC 4 in the UK on the 28th June at 9pm, called Inside Porton Down. The trailer looks interesting. Will be available on i player, not sure if it can be seen outside the UK ? Link : -
http://www.bbc.co.uk/mediacentre/latestnews/2016/inside-porton-down
http://www.bbc.co.uk/mediacentre/latestnews/2016/inside-porton-down