Hi Peter,
Thanks for the input! On our current course page we have a sco activity that needs to be completed too, so that makes it a bit tricky. I see we can't edit a quiz that has been attempted so if the course completion only required the quiz activity to be completed then I can see that we could archive questions, add a new quiz activity (hide the old one) and update the course completion to be any one of the quiz activities must be completed.
Have you had a situation where the course completion criteria included a 3rd element e.g. sco and then either old quiz or new quiz?
Thanks
Clive