It is me again!

That is really useful and so simple - thank you.

I appreciate I have taken up a lot of your time but wonder do you know of good tutorials for learning Boolean logic and formulae and conditional formatting too? I have used YouTube and such but find these sources somewhat limited.

I came from the old school (Lotus 123, SuperCalc, and such) so find it easier to create charts and manipulate data in the 'non-tabular' form, as I find Excel's 'automated' approach difficult to understand and, due to my limited knowledge, it restricts my capability. However, I will reorganise this data as you advise and see if I can get to grips with Excel.

Thanks again for all your help and patience.