[Mithalwen]

Only time now to answer the easy point, Galin, the access issue is explained simply by the fact that copyright does not go hand in hand with ownership of the physical object. Copyright unless transferred belongs to the writer (unless they are commissioned or employed). So with a letter which by its nature usually is parted from its writer, the copyright stays with the writer and the manuscript goes to the recipient who is the legal owner of the artefact but has no right to publish the contents. So in this instance Hilary's descendent are the legal owners of the letters and of course may show them to whomsoever they wish. However noone may publish the letters without the consent of the estate. So the estate has no control over access to this material but it does over publication.