The Sally Lockhart trilogy is set in Victorian England. I can't see a way of solving that conundrum. But the late Victorian period is OK, languagewise, and besides that, it's on the cusp of the modern world, with things like telephones and careers for women just coming in. A fascinating time. Count Karlstein was published in Britain 16 years ago.
Stage plays are different, no doubt about it.
I enjoy the discipline, though. Clockwork is reminiscent of the wonderful gothic fairy tales of E.T.A. Hoffmann . And I'm going to do more stories in that vein, too. My favorite children's books are the Moomin stories by Tove Jansson and a book by the Australian Norman Lindsay called The Magic Pudding . Actually, there are lots of them.