Sport is the 'entry-level' trim and comes with pretty much all that you might expect and need, including 18in alloy wheels, two-zone air-conditioning, cruise control, heated M Sport seats, front and rear parking sensors and automatic LED headlights and wipers. On top of that you get BMW's cracking 10.3in touchscreen infotainment system with DAB radio, sat-nav, Bluetooth and Apple CarPlay. 

The same engine that you get in the sDrive 20i but with a much healthier 255bhp. It's quick, too, getting from 0-62mph in just 5.3 seconds. However, it suffers from the same monotonous engine note as the base sDrive 20i and the gearbox is just as sluggish. Therefore, we'd advise you by the cheaper sDrive 20i if you want a Z4 to cruise about in, while those who want something that sounds good should look at the full-fat M40i.