The video in my last post but one refers to Porton Down where David Kelly worked for a number of years, and there is also some interview footage in it with Bill Patrick of Fort Detrick, the counterpart of Porton Down in the US.
Porton Down is in Wiltshire and Operation Antler conducted by Wiltshire Constabulary investigated claims that volunteers were tricked into taking part in experiments there that led to some suffering long term illness or injury. I am no expert on Operation Antler and my main reason for mentioning it is to highlight the very murky world of chemical and biological weapons. Operation Antler seems to have been quietly closed down not long before the death of Dr Kelly. I have no reason to believe or disbelieve that there was any connection between Dr Kelly's death and Operation Antler but a little more can be read about it in Andrew Watt's excellent blog "Chilcot's Cheating Us" http://chilcotscheatingus.blogspot.co.uk/2011/02/death-of-david-kelly-operation-antler.html It's worth reading the appended comments too.
I don't think that I can add anything further but will just mention that a group of Porton Down test veterans have at least now got some compensation http://www.leighday.co.uk/News/2008/January-2008/Porton-Down-test-veterans-settle-claim-for-3m