They ARE street legal, I see one in my Home Town. Sounds like the God Of Thunder. The Defenders are not avilable in the US due to impact Regs Smog ect, These are. There is also a version based on the new Range Rover Sport.

TopGear is a great thing to YOUTUBE, CLarkson is great.

http://www.bowler-offroad.com/Nemesis/Choiceindex.htm