Thanks Mark
I'm using Lightroom, not Photoshop, to print although I did try Photoshop (and QTR print) as well.
I've done each of the steps you suggested. The issue is that in every case, no option to select "Roll Paper" appears under page setup. (I put a copy of the dialog with my first post)
I'm wondering whether, even though I was careful to install driver 9.41 and not the 'Airprint' version, it is possible that I have the 'Airprint' version of the page setup dialog? (I read here that it has fewer options) Is that even plausible? And if so, how to fix it?
Tim