We always combine postage for winners of multiple items. Please request an invoice from Ebay.
Please note that we have wasted enough time fighting against, whilst trying to understand, Ebay's various postage policies. It is our intention to combine postage, it is our intention not to profit from postage. But it is Ebay that takes the money, not us.
If you do not like the postage charges, don't bid. 
For Overseas buyers, we will always refund any difference between the charge and what we actually pay. For UK buyers, waste your time and spend 1/2 - 1 hour talking to Ebay's Help Desk.