As an aside, Jack Hall, a real person, also known as Sam Hall - chimney sweep, chimney sweep, was sold to a chimney sweep by his parents, for a pound or thereabouts. But he quickly decided that being a thief was a much more profitable, and safer, profession, even if he did end up being hanged. While waiting in prison for his end he wrote a dictionary of cant and criminal slang, and now appears in the Oxford Dictionary of National Biography.