Thanks for that Craig,

You say I can make a quiz for users who have not attempted the quiz - is that a new quiz I need to make or can I leave the quiz activity alone?

So far when I try to test it with users as you say (A user who has attempted the quiz with a question from the old category will see the old question and answer when reattempting), I cannot edit the quiz as it has already been attempted?

I have another question - I'm being told that I need to build one question bank per question to get the functionality of different users seeing the different versions of questions. Is that true? This seems over the top to me but I can't get it to work.

Thanks

Lauren