Hi Les. While I can't help with this particular problem, have you taken a look at the relevant pages on our NLN site?
http://www.nln.ac.uk/?p=Moodle - describes all the various options for using the NLN materials within Moodle.
http://www.nln.ac.uk/?p=Noodle - a page dedicated to our "NLN Materials browser for Moodle" (or "Noodle") plug-in, which provides easy access for tutors and learners to the whole library of NLN materials, without having to download them. There's a thread on this forum dedicated to Noodle at http://moodle.org/mod/forum/discuss.php?d=105505
Note that Noodle is currently in beta, but we're planning to release version 1.0 next week.