'The magnificence of the Ambersons began in 1873...' but their grandeur, like Orson Welles's, was complex and transitory and his film The Magnificent Ambersons is as flawed as the family it describes. Simon Callow's new volume of Welles biography, Hello Americans, goes into sympathetic detail over the director's problematic shoot and subsequent desertion of his film but, although it's frustrating that we'll never have his original version, there is much to love here.