You may not be aware that UK and Aus have a mutual Tax agreement that pensions are not taxed if you live in reciprocal countries and earn [and pay tax] in the other.
ie your UK pension will not attract UK tax if you live and earn in Aus.
It will not earn tax in Aus but will be added to youir total Aus income to ascertain your Aus tax bracket.
Did not answer your question but that info may be helpful regardless.