At Warrnambool you need an AirBP swipe card to use the pump without any assistance. I got stuck there with every card except the BP one but during office hours (refer ERSA) Air Warrnambool allow you to pay by any method (cheque, credit etc) but they have to swipe their card through the bowser. It also attracts a fee, AVGAS bought without an AirBP carnet card is 10c/L more expensive. I think it was $1.82 with carnet, so $1.92 otherwise.
Needed some oil there too but BP have stopped producing it! So none available there, will need to start buying some 1L bottles!