Thank you to all that replied.
I was hoping for a GUI solution rather than command line.
I did try Adobe Reader 8 under Debian and although it is possible to print the actual view, rather than the whole page, when I tried that it printed the portion in view but at the same scale required to get the whole document on the page - much too small.
I did then think to try Adobe Reader 8 on Windows XP which was supplied with my laptop but seldom used. That printed the selected view at the correct (larger scale). So is the problem in Debian a printer driver thing (Postscript) or an Adobe problem?
I do have a similar problem if I try to print a page from a web browser. The page prints but as a ridiculously small image in the corner of an A4 sheet. All other applications print as I expect.