Hi folks, I would be grateful for any tips or advice. I worked for 6 months in the UK between April and Sept (some subcontracting some agency) before arriving here in October (it was March before I found a job). I now realize that even employed people in Oz have to fill out a tax return. Is it possible (or any benefit) to do one tax return to cover both or should I be doing a tax return in each country? Thanks in advance.

You'll have to do an Aus one anyway.

Depending on your circumstances you can do one for the UK in addition. If you were a normal employee in the UK then you are probably due some tax back if you have not already claimed through the P85.