Thanks Crow. Easily installed and allows multiple pages, but I cannot see how to set the manual page size setting. So I settled for a slightly smaller booklet by printing 4 pages on each side of US letter size sheets, with zero margins and backed up (two passes, my printer doesn't do double sided.)
Much to my surprise I got the page order right first time. If anyone else is trying to print a 16 page booklet this way the order is:- 16,14,1,3,12,10,5,7 followed by 2,4,15,13,6,8,11,9 on the backs of the two sheets.
(Actually I think I could have done this using the Adobe reader too.)