Thanks to all of you for your suggestions. Not only is my request answered,
I've learnt about seven other things!

"Geoff C" wrote:

> Would like to format font size in one column, according to a value in
> another, e.g. if I have the data
>
> A B
> 1 12 X
> 2 6 Y
> 3 16 X
> 4 9 Y
> ..
>
> I would like the font size of the cells in column B to be the relevant
> number in column A
>
> (Going to use wingding arrows in B, but they won't display here)
>
> Thanks,
> Geoff.