Well, the session this morning went okay. The handouts did arrive on time (thank God!) and the exercises seemed to have the desired effect.
After an initial set of slightly offended glares ("Are you implying we *would*?!"), the students buckled into the workshop and I discovered once again that my beloved PGC Tutor hadn't been kidding when she said that often students didn't know what exactly we meant by plagiarism.
As a result of this morning's teaching, I am going to make a couple of changes to my session on referencing next week.