After a bit of fiddling around I eventually found how to get rid of it.
Very simple -at the top of the nVidia Control Panel screen you see
a toolbar with
'3D Settings' tab next to 'File, Edit and View', from the top left CP Window.
Simply uncheck 'Show SLI Visial Indicators'.
I often wonder why the most simplest of tasks are sometimes the most diffiicult to do
Cheers
