Thanks for your comments Rakey, can you recommend any websites I should do some reading on?
(the Aussie rules is a weird one - I've spoke to shops, if they don't actually meet the Australian rules then they're deemed to be illegal even though they might comply to the European or UK standards...) Probably the same reason why MINI Aust didn't bother to bring in the lovely looking seat - the market's too small to justify the expense in testing them to conform with the Aussie standards.