VoR. I have always argued that while not a legislative requirement for Class E airspace to be under radar coverage, since "the passing of Radar observed VFR traffic" is such a huge component of the workings of E airspace I have always personally felt it is best suited to a radar environment. In my opinion non-radar airspace is best suited where there are high performance jets operating to being classified C, and have everything positively separated. Non-radar E, leaves too much reliance to visual separation, which invariably then leads to the odd TCAS avoidance. This TCAS reliance is especially disturbing in some parts of Oz, where some aircrafts transponders, if turned on at all, have probably never actually interrogated a radar head, so the value of TCAS could be seriously undermined. I am sure your little committee will make some condascending "we know best cos we are from the good old U S of A" but australians know Australian conditions better than anyone thanks.