Icarus2000 and HKF, Perth RWY priority due noise abatement is 21 and/or 24, then 03 then 06, arrivals and departures. On a dry RWY with 5 knots or less downwind, those are the runways that MUST be used. ATC has no say in the matter. The rules have to be obeyed, they don't have to make sense.