The Valhalla Spider is the roofless version of Aston Martin’s mid-engined plug-in hybrid supercar, and the brand claims it’s its fastest open-top car yet. The Spider uses the same 1,079hp setup as the Valhalla Coupe, combining a 4.0-litre twin-turbo V8 with three electric motors. Aston Martin says it can reach 350kph with the roof off. A fabric roof is standard in most markets, while a carbon-fibre hard-top is optional.