Final update: there clearly aren't enough beaders anywhere near Poole who want to learn how to bead a cabochon, or at any rate not from me
Just got a call from the owner of Beads 47 to say she's cancelled the class as not enough people booked... although on the bright side, at least I got the call BEFORE I'd printed out all the handouts, packed the demo box etc. etc.
And I now have lots of kits all boxed and ready to go, which will doubtless save me a job later on...
I hope to do more classes at this shop, but if nobody books for them I won't be asked too many more times...
