Thanks Gordon - I'll give it a try when I feel brave as I have almost 20,000 images on my hard disk, (I am going through them to "prune" them, but It just takes so long to decide which to keep and which to delete).
20,000. You need to get out with a camera more often.
My current personal catalogue has 87,000 images in it. My work catalogue has 275,000 images in it (plus the 2.5K I shot today).