New town planned and built to serve a particular local industry, or as a dormitory or overspill town for people who work in a nearby metropolis. New towns in Britain include Port Sunlight near Birkenhead (Cheshire), built to house workers at Lever Brothers soap factories. More recent examples include Welwyn Garden City (1948), Cumbernauld (1955), and Milton Keynes (1967). Other new towns include Letchworth (Hertfordshire), established in 1903, Basildon (1949), Corby (1950), and Harlow (1947). There are 31 such towns in the UK planned by a government-financed corporation, in cooperation with the local authority. When they are completed, control passes to the New Town Commission. Their populations will range from 50,000 (Welwyn) to 250,000 (Milton Keynes) by the end of the century. Problems once caused by lack of social amenities for early arrivals are now overcome by basing a new town on an existing centre.