I hadn't driven the Z in a couple of months due to waiting for club rego paperwork.
It wouldn't kick to life, normally it starts quite easily. Fuel was getting through pump, etc so decided to clean fuel bowls. Surely enough, fuel had dried up and turned to crud.
Interestingly enough, one of the bowls still had what looked to be like the original copper (or some sort of metal) float.
Started without an issue after a good clean.