Board Thread:Spoilers!/@comment-26837468-20150311103729/@comment-4839682-20150414172039

No, it's "Fictional 1920s London", which makes it separate from Alice's Victorian England. (It's already been established that that world is a perpetual Victorian time period)

Now "Fictional 1920s London" could mean its own separate world, or it could mean just a fictional London.

Everyone is very riled up about that phrase XD but this is one situation we're better served just waiting for the episode, rather than drive ourselves crazy trying to figure it out.