If you think you can get the ok to fly in Aust within 2 hours you are outta touch buddy. Different rules and familiarisation with area is a must so I would suggest a good briefing and a short navex. Most schools will require at least 2 hours in general handling just for insurance purposes. Get your temporary licence from CASA first and start calling around. Aviod the big schools as they have instructors that can barely fly themselves because they are soooo young. Find a school that treats you as a person and not a number or $$ signs. Some small schools are also money hungry so beware. My recommendations are Minovation (who specialise on UK to AUS conversion) , the Aeroplane Company and Jandakot Flight Centre. All of these are tructworthy and have good CFI's and well rounded and aged instructors. Goodluck!!