W8 I am aware of that. This was an air tractor who had chosen NOT to use his radio, as many people here seem to think is OK, while I had made what were at the time mandatory calls. There is an AFRU at Northam.
This is an example of when people think that "see and avoid" is enough for situational awareness and presumably why CASA have removed the mandatory requirement for certain calls. This guy had no idea there were other aircraft in the circuit or the runway in use, unless he thought that as his aircraft was about 4x bigger than all the others he could just blast off and we would get out of the way. Which luckily we were able to.