1. Displaying the contents of PDF files
If you select a menu or a drop down menu that contains an Adobe PDF file the contents may obscure the remaining menu buttons. This is not a fault in the Website, but is caused by the way that some browsers display Adobe PDF files i.e. they will always be placed in front of everything else, unfortunately this effect cannot be prevented.
In order to view what is behind the PDF file you will need to click on the "Go Back Button" i.e. the blue circle with the white arrow at the top left hand corner of your screen.