Milton Keynes, in Buckinghamshire, is England's largest new town. It was designated in 1967, with an intended target population of 250,000. Between 1967 and 1970, the key planning principles and the overall framework for the new urban area were worked out, and published, by Milton Keynes Development Corporation (hereafter MKDC). Construction of the new city began in 1970, and people started to move in very soon after the first homes had been built. Since 1970, it has been England's fastest growing city.