I remembered seeing Jeremy Clarkson have a few laughs in this beast and actually had to go to the internet to prove that what I was seeing was real, but, in fact, the Noble M400 is available in the US. I found this link to a R&T article about how to procure this "kit" car:
http://www.roadandtrack.com/article.asp?section_id=7&article_id=3180
Attached is the photo I was able to snap while on a location scout in the LA suburb of Stevenson's Ranch last week. All I can tell you was after he took this corner, the car was GONE! Not sure if it was even street legal (no license plates) but it sure looked fun to drive.