If you correctly change your account status to a business one you can choose your own postage method and cost, and your listing prices won't have a buyer protection fee added on to them either.
Smply go to your Personal Information in your account and to the right of Account Type, which will be showing as 'Individual' you'll see an Edit option.
https://accountsettings.ebay.co.uk/profile
This doesn't affect your feedback profile or any current listings, it merely upgrades your account so that you're compliant with current consumer and eBay policy.