My British friend left Australia when he was on a Working Holiday Visa without paying his drink driving fine of $700 and is wondering if he would be allowed back in the country if he pays it, even though it was 2 years ago?
Australia requires everyone entering the country who isn't a citizen to be of good character (or have the requirement waived, which is so rare it's not discussed on the website and you'll probably need a lawyer if you're in this situation). This has specific requirements in Australian law. Most of these are for particular offenses or sentences, but there is a catch-all:
(c) having regard to either or both of the following:
(i) the person's past and present criminal conduct; (ii) the person's past and present general conduct;
the person is not of good character; or
It's conceivable that an immigration officer might decide that someone who has not paid their fine is not of good character under this subsection.
Other than that, a fine and driving disqualification does not really meet any of the listed requirements which would cause a finding of not passing the character test.
Remember that you need to tick Yes on the landing card and disclose the conviction to the immigration officer. You'll have a chat with the immigration officer, likely about why it took so long to pay the fine, and the officer will assess your character. Ticking No is a great way to guarantee a refusal of entry.