Hi,

I'll let our resident taxman advise you about the Australian tax but there are a few things you should definitely be aware of:

1) Overseas landlord tax: You need to register as an overseas landlord with HM Revenue & Customs. If you don't you get nailed with tax to the tune of £70 per month (or thereabouts) see here for more info:
http://www.hmrc.gov.uk/cnr/nr_landlords.htm

2) Notify you mortgage company that you will be letting. This is a requirement. If you are leaving a property in the Uk then you should DEFINITELY speak to our Mortgage Experts (it costs nothing to have a chat with them). I know it is probably the last thing on your mind but a quick phone call to them could make your life SO MUCH EASIER later on (voice of experience talking there). See the "Mortgages for doctors" section

Cheers for now
Iain