Sorry
Wiz, I stand corrected on that Whale fuel policy for Sydney; I was told the other day they'd canned it after only a few days of silliness.
You cannot jettison to below Max Landing weight in the majority of cases if the ZFW is high.
As I said, I'm surprised - not being a Whale rider and all it did seem unlikely to me.
At the risk of pedanticism,
ADDNL 6000
NO TANKERING RECOMMENDED
I guess there's a difference between "tankering" (carrying extra fuel to avoid refueling) and carrying additional for "curfew" holding. Not least the 1% rule.