So caution needs to be exercised. Yet the experience of being at the wheel of a landmark vehicle is exhilarating. The Simplex has it all: H gearbox, several independent brakes, which are activated by means of a hand lever and by pedals on left and right, and a steering system that demands lots of muscle power. On going into one of the many curves, you need to clasp your fingers around the wooden rim of the steering wheel, which is as thick as a sausage, and heave the vehicle round the bend with all your might. This also requires you to shift your body weight. 'It's quite a struggle,' admits ex-Formula One driver David Coulthard, who made his way up the hill in another Mercedes-Simplex.