Thanks to both of you.

silver, I am currently using travel.co.nz to help me look fares up - I've always liked how travel.com.au (.co.nz) have the rules so easy to jump to (unlike some of the American sites who tend to want to simplify them all). I didn't notice a way to look up J class fares though, which is a bit strange. Perhaps ask koruflyer?

I have a feeling this isn't possible but can I go PER->AKL->PER->LON->...etc.? If so, would it make any difference if I were to go PER->AKL straight away and jump to the 2nd RTW then (ie AKL->ASIA->...->AKL) - I wouldn't have satisfied the minimum stay of the first when starting the second, but would eventually.

All of this is because I need to be back on Perth on the 8th but back in England on the 9th and don't want to pay the high season Australian fares that start on the 9th.