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A quick google suggests that the average wage in Australia is about $72000. Which is about £39000. That's about £13000 more than the average wage in the UK.

I suppose most of that is danger money for the fact that everything there is poisonous and out to kill you.

The equivalence ratio I mentioned earlier (to take account of a higher cost of living), converts that $72000 average wage to £30k, which is only £4k more than the average UK wage. Fair enough, that's still 15% higher, but nowhere near your 50%.

If you can get paid in AUD whilst living in the UK without being taxed twice you're onto a winner.