From the introduction:
The Imperial Age line is largely a collection of tools that enable you, the Game Master, to take inspiration from diverse Victorian themes and genres, from detective fiction to steampunk, and use them to craft a unique and entertaining Imperial Age campaign. This product presents the quintessential city of most Victorian and Victorian-esque fiction, London, to use as a background for such campaigns.
Because of the Imperial Age’s diversity and versatility, the London presented in this work is the historical London of the Imperial Age. In order to ensure that this setting will be useful in all Imperial Age campaigns, no fantastic elements have been added. You are encouraged to personalize London as you see fit, incorporating those Imperial Age products that you’ve chosen to use for your campaign.
So put on your morning coat, grab your bowler and walking stick, and prepare to tour the greatest city of the Imperial Age!