there are 4 models of Drz400 in the uk 2 enduro models one with kick only and the DRZ400E with leccy foot, both have flat slide carbs higher comp and a few other internal changes.
Trail version Is the DRZ400S CV carb i think, and the SM model that hackbridge is on about is a different bike altogether but more based on the S than the E models. Its a good fun bike once you get rid of the poo exhaust system.