Thanks Mike - thats great information - I couldn't find anything on the Immi website, sometimes I'm sure they hide things!!!
I will let my parents know, as I think they'd be quite interested if we end up settling out there when we go. By that time, fingers crossed, 5 years would have passed and hopefully cancer-free, so that sounds good what you're saying!
Thanks again, big relief for me too, as at least it could be an option (rather than it never being possible!) :-)