So I replaced the brake fluid in the clutch master cylinder, vacuum bled the outboard fitting under the seat and refilled it.
Now I see a bit of fluid oozing from the lid. There appear to be two slots in the lid to act as vents, its coming from there.
I pulled the level lower a couple of times and now I get a bit of moisture around the two vents. I guess the answer to my question is probably pull the level down to where it shows in the window.
What do you say? Anyone else had this happen?