Test drive: BYD's Seal-U SUV to come with hybrid power

It is tipping down so hard with rain that the track officials have put out cones, not to indicate braking and turn-in points but to show us where the deepest standing water is, so that we can swerve around it. It's the kind of weather that would have Formula One officials sending out the safety car for a few desultory laps before deciding that it's too dangerous to drive, and that the weekend is a washout. However, with a flash of amber lights, our own safety car wanders out on to the track and heads off down the front straight…