OK, assuming I can;t reformat the merge fields I've set them up as text format in Excel and I'll have to tweak them from there.

Final query - is there a way of controlling the cell width? - only way I can see is by using a header, but I can't go with that option here. I can re-size, but it snaps back to whenever refreshed.

Is there a way to do this from the \l \b switches? - I can't see one!