It was from a very dry documentary series which I found being repeated late at night on BBC4 a couple of years ago - http://www.bbc.co.uk/programmes/b00hvb9g/episodes/guide - worth watching. There was a book too - http://www.amazon.co.uk/From-Modern-Motoring-Nicholas-Barker/dp/0563369841/ref=sr_1_cc_1?s=aps&ie=UTF8&qid=1331523180&sr=1-1-catcorr .