In the course of the recent discussion on what does or doesn't constitute plagiarism when writing fiction, and how, why and when authors should document their sources, it became obvious there is a lot of confusion about the kind of research that goes into a historical romance and how this research is incorporated into the individual story. I thought it might be a good idea to clear up some of this confusion, and for this reason I started a series of talks about research on my podcast. The first episode of "Putting the History into the Historical" is now online and deals with historical London as a setting in fiction. I list all the general works on London I own (this includes a happy, squealing dive into my new 19th-century guide book), as well as more specific works on the Holland House circle and Albany, which I used for THE LILY BRAND and BETRAYAL respectively.
Here are a few of the online sources I mention in the podcast:
Greenwood's Map of London (1827)
Images of 19th-century London
More info about Albany with many pictures (that's where I found the picture of the Rope Walk above).
And finally, here's a picture of Holland House from Princess Marie Liechtenstein's HOLLAND HOUSE: