Eminence are imported by SMART Distribtion. Ian, their MD, posts on here and especially under the Affiliates section. I think they're based in Kent somewhere, but when I checked as I wanted to try one out Ian said they don't hold stock and just bring them in as and when people order them; very short lead time though.
The base model, fixed neck 4 string, is around £1800, which was too much for me to take a punt on an untried format, so I plumped for the Aria SWB. I'm actually glad I got the Aria as it's sonically more versatile (mag and piezo pickups) and smaller, although the aesthete in me much prefers the look of the Eminence.
Cheers
Gareth