After a small test in the heart of London, Vallie has started to expand its on-demand valet parking service. At least a little bit, anyway. The app now covers a slightly larger patch of the city, stretching as far as King's Cross St. Pancras station in the North, Whitechapel in the East and Marble Arch station in the West. It then drops down towards the Thames and snakes along the Northern edge of the river, never quite encroaching Southwark or its surrounding boroughs. Vallie now claims to cover "all of central London" -- we'll let you decide whether that statement is accurate.