From Ed T's link "The UK and Iraq's Falluja 2 chlorine plant"

"Uhde Ltd's parent company in Dortmund, Germany, issued a statement confirming that their then UK subsidiary had built Falluja 2 for Iraq's chemical weapons procurement agency, the State Enterprise for Pesticide Production. A company spokesman said: "This was a normal plant for the production of chlorine and caustic soda. It could not produce other products".

So what part did the UK/Germany/the USA play in Iraq's CW production facilities?

The second link basically supports everything I have said and makes the rather obvious point that once invented you cannot "uninvent the science" - i.e. Iraq could reacquire and reactivate its WMD, WMD research and WMD delivery systems programmes at any time it wished to do so.