Hydrogen powered engine (did think of 170 bhp diesel from VW Passat as alternative but definitely with a DPF, to avoid the soot!!!). No pollution with the Hydrogen and so no black marks on pretty white paint.Self-levelling suspension as in the big Citroens for ultimate comfort.Hill assist function.Self parking function.Lane drifting alert function.Double glazing as in the big Mercs to help against frost and noise.Panoramic roof for the few glorious sunny days we get.Full LED headlamps for a nice bright white.Tracks that can drop at the push of a button to help with snow and ice.Nice mid-grey leather seats and interior panels with black and white contrast stitching.The tyres wouldn't be any more skinny than they are just now. Maybe even thicker profile (Say 65 or 70%) to make the ride even smoother.Ice compartment for the drinks for those hot summer days when we all get together for a meet along the promenade at Aberdeen beach. (It is a longgg!!! prom with stacks of room for everyone's car).Reactive tinted windows.Start/stop to enjoy the peace and quiet in the traffic jams.And last but, not least - a 20,000 volt ultra-low current shock system for people you don't want touching the car (some children have very sticky fingers).