Solved - found in another toolbox. It was included as part of a demo in the Bioinformatics Toolbox.
The below is from the doc file for it for future reference...
suptitle puts a title above all subplots.
suptitle('text') adds text to the top of the figure
above all subplots (a "super title"). Use this function
after all subplot commands.
suptitle is a helper function for yeastdemo.