How Do you Calculate Combined Shipping Estimate for International Buyer?

[blankenburghaus2008]

I had a potential buyer from the UK today ask what combined shipping would be for multiple items.  I have the total weight, but with Ebay Global Shipping Program, wasn't sure where to go to calculate the estimate.  I called Ebay and, as usual, they couldn't tell me either!

[disneyshopper]

The Global Shipping Program, which is now transitioned to ebay's International Shipping, does not allow combined shipping,  Each item has to be shipped separately.