As of April 2025, I am now a business seller, so no more "Buyer Protection Fee". Combined shipping - choose as many stamps and/or postcards as you like, use "add to basket", and pay at "checkout", and only pay shipping once. And my postage rates are the actual Royal Mail ones (or less). Stamps used on all mail, and using a mix of older stamps, the postal system treats them as first class, although you only pay the second class rate.
As well as adding new stamp listings most days, postcard listings are being moved over from my Bestbritishpostcards and Postedcards Ebay stores. Now 20,000+ listings, rather than 6,000.