They've banned Leaded fuel in England, but for most cars a little adjustment will mean they run fine on unleaded - most German cars have run on unleaded since the (early?) '80s anyway, so it shouldn't be a problem.. if it was me, I'd definitely get a late model 190E, or if I could afford to run it, a 300E and perhaps even a W126 380-500SE.
The 2.0 was never available in the US, likewise the C180/200, E200 etc. .. with fuel so cheap, it does make a little less sense. Emissions regs would strangle the engines a lot, too - their 2.3 (not available here) only had 130 bhp.. an 8 bhp gain.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black