A call to Atherton Camping and Gas was very helpful and they suggested that it could be a faulty regulator and mentioned a particular regulator that was known for causing problems.
Of course that's what Yemmy had fitted. That's it on the right.
Paul took me to the shop and a new unit was only $59. The man said that even if my regulator was still working it was only a matter of time before it packed up. There was a bit of fiddling fitting the new one as the mounting plate was different but I carry a cordless drill and used that to drill a few holes for self-tappers.
It seems to working better but I'll know for sure after a few days of use.
The Rocky Creek Memorial Park near Tolga has always been crowded in past years but today there were only about nine RVs there. A new set of conditions have been adopted that include a maximum stay of 72 hours, no grey water to go on the ground, all units to be self sufficient, no camping in tents, cars or small motor homes and a donation of $5/night.
A walk to the shop to buy some ginger beer helped get my steps up - today 3,095 steps and 2.1km.