I have set up zone rate shipping and it all seems to be working correctly, one small snag has just become apparent though after a GB customer was charged the overseas handling charge.

I have used just two zones that are basically GB in zone 1 and rest of the world (00) in zone 2, this zone has a handling charge added to the same rates as zone 1 to cover airmail costs etc and it all worked fine during testing - I changed the address on an overseas test account and the shipping value was calculated correctly.

The problem is that by default it's applying the handling charge to all shipping - in the checkout it's showing as; Zone Rates (Shipping to ) with no country code.
In the section further down there is a radio button that is pre selected that says 'zone rates' and 'shipping to GB' if the customer is from GB - clicking this again removes the handling charge and charges the correct shipping - so the snag is customers are by passing this (clicking it again) as the radio button is pre selected by default.

Is there a way around this?