Betfair ? How can that be?
Once they know you are from Oz doesn't that stop you betting on Australian races?

only if you live in NSW or WA.

This is the 1st year I've done this and I made money on both Caulfield Cup & Melb Cup.
Back them, then Lay them to reduce your risk.
Only won $150 on Caulfield Cup (with no risk on the day) & $550 on Melb Cup (risk of $36). Next year will bet bigger now I know what I'm doing.
This year all I did was put $20-$40 on horses and then lay them when the race was about 2 weeks away or whenever I felt comfortable, when MOST not all, had shortened (eg She's Archie, backed @ $65 for $15, then layed @ $9 for $75)

Give it a go next year.