There were several Nismo editions of the 350Z but they were never sold in The U.K. Back in 2005 The S-Tune Nismo was announced for The U.K market at £50,000, Nissan brought one over for the journalists to test drive but nothing was ever heard of it again although it was sold in Japan and The U.S and I don't know of any that were imported. They were nothing special really, 296 engine and lots of tweaks here and there but difficult to justify a 20k premium over a GT. The 380RS (around 340 bhp)was a very limited production model, only 300 made and only sold in Japan and I believe that for some reason they couldn't be imported due to U.K regulations (although I did hear that at least one did find it's way over here).
Pete
did they not make a 400RS version or something like that? 400hp N/A for a race league in japan? don't think it ever became a road car but would be awesome if it did!