sera2775:
Hugh,
My Happy Wanderer looks like it has the same disease as yours. It was doing well up to about 3 months ago, then the leaves began looking sickly, curling, capillaries became prominent, and some died. I have attached picture below.
I followed Gardening Australia advice about using a white oil - a solution of dishwashing liquid and sunflower oil - spray, b, but, the majority of the plant is still infected. I have also cut back about 2/3rds of the plant. If you hear any other solutions, I would be interested.
Thank you
Nick