Oh, geez, that story. I had charts for all the twists in that story. You could practically wallpaper a room with them. (And, looking back on it now, I'm pretty sure there's a gap in Martha's storyline - but none of the readers pointed it out, so I'm just going to pretend it isn't there. Shhh.)

Much as I love time travel, I sorta think there's not much point doing a "normal world" AU if you're going to just add that sort of thing back in anyway. Especially since I wanted the ending to be a surprise, and when you're talking Whoniverse, that's pretty much the least surprising plot element imaginable :P