I found the "Desktop site" link hidden at the very bottom of the watchlist page. It sent me on a doom loop to Account Details on, er, the new site.
Aaargggh. The calculate shipping button has vanished. It was such a brilliant feature and it's gone. HELP. OK, so I listed an item on the new look website and all worked ok until I got to shipping. I used to be able to let people know how much shipping would be, now I can't. Plus, it means that PayNow by Ping doesn't work anymore as it needs to know shipping costs. Disaster. These were the only two useful changes in the last decade.