For all orders being sent to Australia, the UK sales tax ("VAT") is not payable.
If you order online the VAT is refundable back onto your credit card or Paypal account. This can be done manually after the order is placed (unforunately our website is not very advanced and cannot avoid charge the VAT at the point of sale).
If you prefer not to pay the VAT upfront, simply email us and we will send you a manual invoice to pay by bank transfer or, if you prefer, a Paypal invoice which you can pay in one click in your Paypal Account.