I would have made several sales this weekend but when they try to buy, eBay tells them I do not ship to the Uk. I am in the Uk and all my shipping is worked on that!
Others have had similar problems. It could be because the buyer is in an outlying area that Evri charge more for (unlike Royal Mail who charge the same for the whole of the UK and channel islands). But you could try putting the buyer's ID on your exemption list to remove any other blocks: https://www.ebay.co.uk/bmgt/ExemptBuyers