I could send you some stuff from the dealer. A new e350 and m350 go for about the same around $40,000. That's kinda the middle of the line. The entry line is the c class and there's now an equivalent suv that runs in the high 20s low 30s here. I'm presuming the pound buys two dollars as well and you're not taxed out the ass.
Try
www.mercedes-Benz.co.Uk that has info as well.