The low-impact round house is still there. And going to be for another year at least.
Apparently the story is--the planning department in Wales thinks that it is awful, don't like the people who put it up. So they passed a regulation that only buildings with minimal environmental impact can be built in the area. But they've also authorised construction of both something that looks like a McMansion (especially in comparison) and the bringing in of some imported (from Estonia) vacation chalets.
Here's a picture from 2004 when they were convinced it was coming down immediately.
(http://www.tlio.org.uk/roundhouse.jpg)
that was from here:
http://www.tlio.org.uk/
Here's Wrench's home page with more information, and pictures of his horses.
http://www.thatroundhouse.info/