London in the eighteenth century was the greatest city in the world, and a magnet that drew men and women from the rest of England in huge numbers. If for a few the streets were paved with gold, for the majority it was a harsh world with little guarantee of money or food. For the poor and destitute, London's streets offered little more than the barest living. Yet men, women and children found a great variety of ways to eke out their existence, sweeping...