So plans are as follows. Leave the Mould Hold on the 8th, stay in Sydney for another 5 or 6 days (depending on the available accommodation at destination B). Leave early in the morning and travel to Canberra, spend a few hours letting the kids run amok at Questacon, maybe do the National Gallery too. Stay the night in the ACT then make a run for Melbourne the next day.
The placenta will travel with us. We decided it is too much of a risk to trust an airline with it.
We located a cat box in the shed, now I just need to find out whether it's an acceptable one to post the moor unsuspecting cat to Antarctica in.