Mr. H, I cannot resist the temptation;
HOWABOUT - Class E+, what is it?
CASA - It is a volume of airspace technically designated as CTA in which compliance with clearances is thus required by inference as per CAR100 - except that VFRs due to alphabet airspace procedures definition do not actually require a clearance to enter said airspace, nor are they required to be separated from IFR aircraft...but that`s not important right now.