Hi Adam,
Looking at the HG Palmers machine there look to be many similarities with the Burco 21 from the early 60's in the UK, the position of the control panel, the agitator, even the valve control, while the Burco 21 had the spin water returned to the wash tub automatically unless you had the empty hose plugged in to empty to the sink the HG you had to select either wash or spin to empty.
Nice machine, I wonder if it was popular in Oz
Cheers
Keith