London in the eighteenth century was a new city, risen from the ashes of the Great Fire of 1666 that had destroyed half its homes and great public buildings. The century that followed was an era of vigorous expansion and large-scale projects, of rapidly changing culture and commerce, as huge numbers of people arrived in the shining city, drawn by its immense wealth and power and its many diversions. Borrowing a phrase from Daniel Defoe, Jerry White...