Thank you for all your replies.
Thank you for clarifying the 6 month rule for me, I appreciate that. ILETS does expire after two years, I took it just to see what I would score so I knew how many points I could definitely get.
You are right everything can change in a few years time, in my heart I am leaning towards staying here longer than the 12 months but only if they raise the WHV age to 35 like they have for Canada, Ireland and France. If not then I'll stay for the 12 months and do the WHV after. I would rather have some experience of Australia, than none at all. Even if it isn't in nursing.