If a private seller lists an item on auction, let’s say they start it at 99p, it is an item where simple delivery isn’t mandatory and they offer custom freepost shipping.

As I understand it, if the bids go above £10, simple delivery may kick in automatically. What will this look like to bidders in practice? If they bid £10.01 will they be shown that their bid is now subject to simple delivery with an added postage charge? Or will the seller actually cover the simple delivery charge from the sale price?

I don’t want to complicate this too much with too many scenarios but if you could clear up how it will work on auctions like that I would be grateful. It doesn’t affect my selling account but I have a private account that I have for buying.