[nigelblake]

Hi Al
Just done a quick levels adjustment on the posted image, and added the levels histograms to show the changes. crop of original post shows a very left biased Histogram, on the second image the top right histogram shows the adjustment to the mid tones and the lightness at the right hand side, (hold down the 'alt' key and the image goes black, as you slide the pointer you get a graphic representation of when highlight clipping occurs). The bottom left shows a more even histogram after the changes are applied. You may find that the saturation will need boosting a tad afterwards.

Of course this is on the posted jpeg, better adjustment can be made to the original file.