Dyson, the engineering company best known for its vacuum cleaners and fans, plans to develop a "radical" electric car. The battery-powered vehicle is due to be launched in 2020. Dyson says 400 staff have been working on the secret project for the past two years at its headquarters. However, the car does not yet exist, with no prototype built, and a factory site is yet to be chosen. Sir James declined to give further details of the project.