Wait for this...
Weekend work on the steering postponed as I didn't know what the heck I was doing
Mind you, I did print out Charles' description of how to bleed a system.
I hadn't found either the distributors or the manufacturers web sites unti you pointed me to them, but I'll probably give Hypro Marine a ring on Monday to see if i should do anything to the "bleed tee" where the fluid is comning from. I'm not sure if it's coming form the base of the tee where it screws into the ram, or from the union nut. Simply tightening these may be all it needs, but I feel a bit better informed now!
Just found this on the "Fill & Purge" section: "Filling the helm full of oil can be done faster if oil is poured into the helm prior to connecting filler tube and oil bottle to the helm"
- so I did need that syringe after all