I've built a site for a friend, as a replacement for a site which is currently built in the Trellix site builder, and I assume with Trellix hosting. Is it possible to publish sites NOT created in Trellix to Trellix hosting? I would be happy to move this site to my hosting, but my host company doesn't handle .co.uk domains, so I have to find an alternative.

Anyone know?

According to Wikipedia Trellix has sold out to some other company and they call themselves Web.com. Looks like they only have the create online facility. But you could find out by contacting them, I guess.