Just tried setting UK at checkout but it's still stating the following so it may well be that you still get charged tax and import duty:
For Orders Delivered Outside Australia:
I understand that I may be charged customs tax when the goods arrive in my country.
If no one is home when they try to deliver you may incurr an additional fee if they have to redeliver or you may choose to collect the goods from their depot.
For International orders, DHL or TNT will be in contact by phone / email to arrange a time for delivery.
Most international orders get through and do not incur additional taxes. This is out of the control of Ay Up Lighting Systems. Read here for more details.