@feargal25 Hi, I have tried to do this a couple of times and decided it is too messy and fiddly to bother. In future tell the would be buyer to watch the items and you can make them an offer, they can counter offer if you allow it. You will see the amount you will get and they will see the amount they will pay, which does not happen when discussing offers through messaging. If they ask for combined postage, I think, if using simple delivery, if they order both at the same time eBay automatically combine into one postage.

You can cancel the order still, but it counts against you unless you use "buyer wants to cancel" so don't do it too often.