Thanks Burrito, I assumed as much. I applied for a Flybe caddetship here in the UK (and got through to final 12 with interviews with the airline but didnt make it down to a single badly answered question, learnt my lesson there!) and the finances were appalling if looking in the long term, I guessed J* would be no different. Sadly the cadetships are nicely dressed up but when you look deeper into them it doesn't work out as viable as other routes.
Done a bit more reading into Jetstar since my original post and it doesn't look an airline I particularly want to give 6 years of my working life away to. I think I'll fund and pursue my carreer another way. I was considering this cadetship strongly for the last few months but have recently having doubts, I think this mornings research has confirmed them!