1955 Standard Motors Vanguard III

Not only was there an all-new and much lower body for the Phase III, but at last Standard did away with the separate chassis and embraced the concept of monocoque construction. As a result, the new car was lighter, with taller gearing that makes it quicker too. An eight inch longer wheelbase aided ride and handling, but otherwise the running gear was pretty much as before. A curved glass windscreen in place of the old split-screen added another touch of modernity, and from 1957 an automatic gearbox option was available.

Information from Octane Magazine.