I'd need to know more about that plant - first I've heard of it being UK built, but it doesn't affect the facts of what I've said about Iraq / Iran. However from what you've said and what I've briefly read, it would appear to fly in the face of the Chemical Weapons legislation.
More interestingly, why did a German company, Uhde, get a UK subsidiary involved in it? Especially when a Libyan plant previously built by a German company (the Rabatt plant) went bang in mysterious circumstances, which ended with the contractors directors in jail for evading export regs.
Curious. I've nothing more to add without knowing a lot more