Simple Delivery is now mandatory for Private sellers.
There are a few exceptions where Custom Postage may still be used, e.g. lightweight / overweight and over size items.
There are bonuses, any item which doesn't reach the buyer, or does and has been damaged in transit, eBay refund the buyer, and thee seller gets to keep the payout. Items are insured for £750 under SD.
This link explains Simple Delivery:
https://www.ebay.co.uk/sellercentre/postage/simple-delivery?mkevt=1&mkpid=2&emsid=0&mkcid=8&bu=43952...
@slush*