Hi Betaboy
Glad I could help others, just as others have helped me, that was the idea!
As a SO you fly the ultra long haul flights, so it's a crew of 4: CDR, SFO who can be the relief CDR, a junior FO and you. So usually you wouldn't fly with the least senior pilot, you would usually be with the Captain or the Senior FO. But having not started yet, I stand to be corrected by CX pilots...