Thanks for your response PaulieD. The problem being is that I am trying to have a menu that will have some links with the orange background and some in the dark grey. Unfortunately I am using a module for a navigation bar and the only way to use the two different colors is by defining a separate class which I have done so.
The problem I am having is that even when i have tried this on the 1 menu (orange) if I activate the last child selector then this gives me the desired image separator on the right hand side of the last menu item but then the image separator (ul#navmenu li.Menu) doesn’t show.
I removed the no-repeat from the last-child selector which then shows up the image separator but not the correct image.
Hope that makes sense.