In case anyone else is stumped by this, I can now answer my own query, thanks to a guy called Mike Head who found the solution.

In win 7 the menus do not always display in full in Sonar

To view and print as A4 -
Make sure that the active screen is the staff view of the track you want, this will display as a ribbon.
If you can not see print or print preview in the file menu, hover your mouse over the bottom border of the file menu mini pull down window, and other items will then pop into view.
A very strange situation, but this is the only way to see print and print preview on my win 7 Sonar set up.