sweet. I got it... Disaproving a precedent occurs when a judge choses not to follow a precedent set at the same level of his/her hierachy. They can do it cos it's not binding- just persuasive.
Does that mean that if for example a judge of the supreme court disaproved of a precedent made by another judge of the supreme court, a judge in the county or magistrates court would be able to chose which one they wanted to follow?
What if the high court disaproves of a precedent it has made? does this mean that two different precedents will forever be applicable as there is no higher court to determine which precedent should stay?
If there was a judge in the Supreme Court in 2003 and a judge in the Supreme Court in 2006 disapproves the decision made by that (previous) judge and chooses to rule otherwise: they will create a new precedent. In this case,
BOTH precedents will remain in force until either is taken up to appeal to either The Court of Appeal or The High Court, who can then overrule the decisions made in the Supreme Court. (Should keep in mind here that it will generally
distinguish between the two cases to create a new precedent).
I would say that the County and Magistrates court would distinguish between which precedent to follow depending on which legal principles are more applicable to the case that has come before them, and I do think that in a court like the Supreme one, judges would follow precedent thats set before them in order to seal in some consistency into the system. In my text book it specifically says "The present court is not bound to follow the earlier decision but for the sake of consistency it usually will". Also the Parliament does not want 300 conflicting common laws floating around about the same case and that's why persuasive precedent is there: all for consistency and predictability. As for answering your question directly:
Both precedents will apply to courts lower in the hierachy. The judges in the County and Magistrates court would distinguish and choose which precedent is most applicable to the case before them and apply the appropriate one.
Same goes with the High Court question you had: they will both apply until overturned by The Full Bench of the High Court. Weeeeeeeeee

I might be wrong but I believe that the Mag's court is not a court of record. Therefore ratio decedendi isnt recorded therefore no precedent is made (persuasive or binding)....
Which means every decision is possibly different for the same offence in the same court..... If you think about it it makes sense, like driving offences. All stuff goes into it so the judge isnt really 'disapproving' the others decision..
the example would however work for the county court but i believe there is only 1 in Vic, so it would just be different judges not locations
I'm pretty sure all judges set precedent: either persuasive or binding. If two cases come up the same in two Magistrates' Courts; the Magistrates Court in Dandenong would look at the decision made by the Magistrates Court in Hawthorn and choose to follow it. Judges want conistency; and driving offences can differ from person to person depending on circumstances and then the consequences are different because they choose to distinguish between the decision earlier. I'm basing that comment on the fact judges must justify their decisions.