I've done a lot of trading on eBay in Oz but only buying here in the UK. I gather the PO are only any good for sending upto 2kg, beyond that it seems to become a quagmire of different companies/couriers etc. I need to be able to quote a postage cost on my listings. How do I calculate it? WHo do you recommend? I imagine the items will be no more than 5kg, max. Thanks!