Can someone clear up for me, the car seat regs in Australia? I have 2 sons one of whom will be 8 when we arrive in April who is very tall and currently uses a Britax booster seat here. My 5 year old is average height and sits on a Graco booster seat with a back on and headrest (designed for those 4+). Is it worth bringing what they currently use and if not what rules will apply when we get there? Cheers!