Oh, my, I'd forgotten the clones business. (I remember, years ago, one of the round-robins we used to do on alt.doctorwho.creative, was about Tegan leaving and going to Sarah and sorting out the clones, which still strikes me as a relatively realitistic proposition for a story. My two chapters would have been a lot better if I'd had the first clue what happened in Resurrection at the time...)

Like I said, we can only volunteer for TARDIS travel in order to find out. :-D