Well, if you do, be sure to avoid the seedier parts of London.
[Because of Jack the Ripper and all. Death by Ripper really isn't all that fun. Although, considering that she's 12, exploring the seedier parts of London may not be an issue?]
I haven't introduced myself. I'm Earl Ciel Phantomhive. Should you find yourself in London, look up my residence and I'll have my servant show you around.