Beloved of French farmers in the 1950s and deified by eco-warriors in the 1980s, Citroen's 2CV was eccentricity personified. The 'tin snail' was slow and ultra-basic but still rather brilliant. Every opening panel could be slid off its flanges, including the doors, boot and bonnet. All the seats could be taken out and turned into picnic furniture. And there were only two springs in the whole suspension system, one on each side of the car.