Chris Harris Drives: Audi RS e-tron GT vs BMW M5 CS

Has the Audi RS e-tron GT ripped up the supersaloon rulebook? To find out, here's Chris Harris testing it against the very car that *invented* the class, the BMW M5. And it's not your boggo £102,000 BMW M5 Competition. No, it's the £140,000 BMW M5 CS with extra horsepower and bronze trim.