Car fiend Graeme worked long hours in the City and knew his car cost him money just to sit on his drive, doing nothing. Not so much an asset, more of a liability. With the help of e-commerce expert Rob, the pair realised that a car-sharing app (an ‘AirBnB for cars’) might offer a smarter, more environmentally friendly way for people in Britain tohire the 10 million cars rented here every year.