I know there a few forums out there on this subject. There is a few confusion about how the do the recruitment like why are people on "HOLD" and what happens. I have read it all depends on the scores and preferred location. The highest scores are at the top of the list with the location with the most availability. See below
"The Outcome of the Sift:
You will be notified of the outcome of the sift via email. If you are successful through the sifting process your
application will be placed on hold, all successful candidates will be placed on a Merit list with the highest
scoring candidates the top. The number of posts available will vary from location to location, as posts become
available in each area, the highest scoring candidates who have selected that location preference will be
appointed. If you are not appointed in the first instance you may be invited to progress your application at a
later date."
Hope this info is helpful.
Ta