Bryan,
Many thanks for your help. The example you have provided is good to know but not quite what I was after. I guess the main problem I have is that doing it that way I have extra labels in the legend which I do not need and also in an ideal world I would like the corresponding bars (positive and negative for each legend category) to be aligned under/above the other. I guess nothing can be perfect though!
What I require is really hard to describe so I have sketched it out and scanned it in! Apologies for the poor drawing!!!!

I am beginning to think it is not possible to do and might have to take a different approach.
Thanks in advance for any on going help.
GW
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