Thanks for the guesses,it's the baby I'm afraid-A45 but boy is it quick,not the grunt of a v8 admittedly but 0-60 in 4.1 seconds and nice pops on the up shifts,suspension is not overly hard but the car feels planted and better feedback through the steering than any other mercedes I've driven,£180 a year road tax and £20 a year more insurance like for like plus 30 + mpg real world if driven half sensibly swung me towards it over a 3 year old cls63amg I was also considering,pics to follow,collecting in 2weeks;-)