I tried Jessops and Boots to get a copy made but they refused on the ground that it was copyright.

Does anyone know how to get around this problem? How much research effort is one supposed to do to track down the heirs of a long dead photographer?

-Take it to a Max Spielmann shop instead, or scan it yourself.

-You could scan it in sections, using an ordinary flat bed scanner, and then reconstitute it as a panoramic image using Irfanview.

http://www.irfanview.com/