Bathurst-Sydney is normally a Metro however ZL557 Parkes-Bathurst-Sydney is a SAAB, so you shouldn't have any problem. Apparently their loads have been 60-70% on this service the last few days. Just mention at check-in that you are connecting to an international flight and can't have your luggage off-loaded; the regionals are sometimes weight-restricted in summer due to the temperature. That shouldn't be a problem on a morning flight, but you never know.
Monty Python's Flying Circus has nothing to do with aviation, except perhaps for Management personnel.