Also, you are not allowed to take duty free items bought in UK to Australia. You must either buy them on the aircraft on the second leg of your flight, or at the Sydney Arrivals duty free shop. Another note (from recent experience!); when you fill out your Oz landing card there is a tick box for 'Are you bringing any food into OZ?'. We thought sweets wouldn't count, but they do! You are allowed to take sweets, crisps etc in, but you must say yes. We didn't and got an official warning letter from a stroppy female Polish immigrant customs officer! (PS I have nothing against Poles in general!!) Have a nice flight.