Check the buyer Feedback profile for > >
Location ( = currently based in ?) ... and for ...
Country of Registration ... click their > 'Items for sale/View listings' < links to see Seller information in the left column ... they can often be very different and if registered/situated anywhere outside the UK , (ie. International) it will trigger an additional 20% VAT fee.
https://www.gov.uk/guidance/vat-and-overseas-goods-sold-to-customers-in-the-uk-using-online-marketpl...