Provided they do not intend to work in France, Australian citizens do not usually need a visa to visit France for a period of less than 90 days.
However, Australian visitors to France do need a visa for stays of greater than 90 days and will need to apply for a Long Stay Visitor visa.
Citizens of the UK and other European Union countries do not usually need a visa to visit France regardless of the length of stay.
You should seek independent advice, but we can provide information on how we successfully applied for a 12 month visitor visa to France in 2012 through the French consulate in Sydney. It was a lot of paperwork but it was definitely worth it.