I think I may push the start date of the Victorian book from 1870 to 1884, or thereabouts.
It all has to do with the Underground. Blackfriars station opened May 1870, and that was originally going to be the impending threat at the heart of this book. (Because of what it means for the Onyx Hall.) But I’m thinking that I may instead want to center the story around the completion of what became the Circle Line, when they connected Aldgate and Mansion House — partly because of the Cannon Street station (which might look significant to those who remember their Onyx Hall geography), and partly because it is a circle: an iron ring around and through the palace. That seems significant to me, even if it goes around a heck of a lot more than just the City of London.
Fortunately, this doesn’t mean huge changes elsewhere in the story — not like it would if I moved, say, Ashes by fourteen years. Some social differences, yes, but the politics in this one are going to be much more internal to the cast, which means I can transplant them around the later Victorian period without too much trouble. (I hope.)
Now if only pushing it back fourteen years meant I got some extra time on my end.