This article in The Observer tells us that the Iraqi “mobile bioweapons labs” were nothing of the sort: they were, in fact, almost certainly mobile units for producing hydrogen to be used for artillery balloons.
Artillery balloons are essentially balloons that are sent up into the atmosphere and relay information on wind direction and speed allowing more accurate artillery fire. Crucially, these systems need to be mobile.
Iraq bought them in 1987. From Britain.
Don’t bang the doors on the way out, BlairyBush.