So currently my other half uses her 2006 SL350 as her daily car but we are looking to start a family so four doors will be a requirement for her in the future. She doesn't do huge mileage any more but obviously the SL isn't great on fuel (around 20mpg) so it would be good if her next car was a bit less thirsty. Here's the thing though, looking at 07/08 W204s there's plenty around for about £7-8k which is the bracket we're considering. Trouble is so many of those are diesels. Now I'm not averse to her buying a diesel in the sense that it'll be good on fuel and have plenty of torque, so should be generally a nice car to drive. Also, there is plenty of opportunity to take the car on long runs regularly to keep the engine healthy so that's not a problem either. As we all know though, diesels are getting very bad press at the moment and this would be a car we'd be aiming to keep for a while. Trouble is we don't want to end up stitched if they enforce restrictions on diesels around where we live (just inside the M25). Just gauging what would be a sensible option? There are plenty of C220 diesels around, not particularly slow and great value. Help?