It is interesting that in the books where the triplets are prefects, there's actually very little story time spent on the prefects as a group. For example, in earlier books, we usually find out which prefect does which job, often via depiction of a prefects meeting, or references through the text. The last year of the series in particular, we get almost no information outside the Big Three, which we get in detail, and Con is appointed magazine prefect instead of elected by her peers, the way it was normally done.
I always wondered how and why the staff would intervene to choose the girl. And wouldn't that be seen as favouritism?
And while I can see why they gave it to Con to help her be more assertive, what happens if another prefect says they want the job as well?
Is there an awkward silence at the first prefects meeting as Len explains it's been given to her sister. Not to mention the owner's niece. And Mrs Maynard's daughter ...
And given that there were almost 20 prefects by Len's day, the voting and allocation of jobs would go on forever.