Thanks rdave: I've just tried the basic version of PDFSam, but it seems to rely on page numbers or bookmarks, which seem to be non-existent in my particular file. I think Adobe would allow me to insert bookmarks, but I have to buy an add-on to achieve that.
I also tried another one which a search brought up, but it can't split it either. So I'm going to to the Print Screen route. I think it's only about 10 pages, so not too much of a burden.