Okee - take 2
I disconnected my FB connection in the wordpress site user I was working in.
I logged on to FB under my own user ID - which has admin rights to the fan page I am building.
I Connected to FB in wordpress via "Settings -> Share", to my fan page (while in my own voice).
I posted a "new" article on my wordpress site and lo and behold, it appeared in FB.
It would be interesting to know whether Username, Password and "Voice" are stored in the connection that is made between WP and FB, and if so, which one.
And, do I need to physically be logged on to FB when posting to my WP site - or will the connection take care of this.
Even though my underlying problem is resolved - it appears to have got resolved magically.
I will leave this post open for a while in the hope that some kind person will answer my residual questions - or point me to answers.