AU from an AU. I don't even know what that is.

A-AU? Gingerbread House? ::frowns:: Are there blimps floating in the air over this London?

The "Cut off Communications" idea is an interesting one too. And The Doctor could figure it out and swoop in to save the day! Or, you know, not. I know it's not a popular reaction in fandom, but I love the darkness of CoE!