You don't remember what you did? Probably for the best, forget I mentioned it.
Erm yer when you brought the tardis back I got thrown back to 19th century Cardiff from there had to travel the slow way for too long, and somehow i've kinda become a fixed point in time and space and have a slight case of immortality, apparently the universe says I have to be alive. The Doctor isn't too keen on it and says I'm wrong he gets a bit touchy about it probably best not to mention it.