Just been perusing Wikipedia (don't laugh!) and under the Oz entry for the F-111 it states...
During the first Gulf War in 1991, the United States Government asked Australia to deploy RF-111 aircraft to the Persian Gulf. This request was denied as the Australian government judged that these aircraft were too important to Australia's security to risk in a distant war.
Now, why would one assume there was a risk involved in sending the Recce pigs to the OS sand pit? Would the risk be from a potential to see one or more shot down and hence a costly attrition in terms of crew/platform and capability to Oz, or was there some other national circumstance at the time such as a possible flair up in our region, ie a coup in Fiji or the like?
Secondly, what type of internal EW suite could have been integrated onto those four R/F-111C to allow for deployment to Iraq?