I've found you can nearly always online shop successfully from uk to Australia. Occasional exceptions where their forms don't accept the UK address formula (what do you mean you don't live in a suburb?)
The only other snag is some big brands lure you in and then you realise you are no longer on an Australian website. had this recently with the official Lego site. Price looks good but why are you charging me $30 postage... ah yes, we have crossed a few oceans and you are charging international shipping. Amazon too, very confusing as you don't even know what kind of dollars you are paying in. I am going to order a scarf for my DS2 shortly, so I will report back.