Stuart - I had the camera so the flat part of the D shape was pointing to the ground when the scope was parked.. The annoyance is It worked fine like this with my Celestron C11, however with the 8" RC it doesnt seem to work? Odd..
Peter - Yes I realized that as I posted the image here.. It was part of my trouble shooting routine on the night.. I'll be sure to rectify that before the next night out...
I'll try re-orientating the axis of the camera in the focuser until all the vectors line up... And it looks as though I'll have to do something about that backlash issue... I've been slowly correcting the backlash compensation in CCDSoft v5 to try and get the vectors orthogonal, But I fear that ultimately this is going to come down to correcting the backlash problem in the gears of the mount..
Cheers for the suggestions so far..
Alex.