I'm Australian too. I got an O-A. It's a little difficult to get but pretty straight forward if you follow the instructions on the web site. It gives you two years of trouble free entry although you will need a re-entry permit in the final year if you plan to leave Thailand. The main advantage for me was that you don't need funds in Thailand. You can show Australian funds including Superannuation. This gives you time to establish yourself, open bank accounts, get a lease, get drivers licences, etc without committing too much.
Sorry but how does a UK bank account generate income. Ok, a term deposit maybe. Or a million quid earning 2%. (This is just an example not an actual calculation). Income is from a pension or rent, etc? Money in the bank is capital, not income.
Just go from bank to bank till one opens one for you. Get a letter from your hotel saying you're staying there. They issue you the ATM card and bank book on the spot.
The police report you just order online. The doctor's report just fill out and hand to your GP. Mine just stamped and signed it. You won't need tests if you see him regularly. The diseases they are worried about are virtually non existent in Oz.