I must be tired.
I do understand that, what I was getting at was, for example; if you were doing the 26 LLZ (MDA 770') and you did not break visual until say 900' (110' below circling MDA). For whatever reason, before or after you commenced the approach, decided a circling approach was required to another RW, you can then (by day only) abandon the approach and circle to land below the specified circling MDA, provided you maintain 300' obstacle clearance along the intended flightpath of the aircraft correct?
I have never been in this situation but I doubt you would do it at somewhere like Essendon of all places.
Sorry for the 5 line sentence and all the ','s, its late.
ID