The Doctor shakes his head. "Based on another earlier companion of mine, girl called Nyssa. Short, with curly brown hair," he describes. Of course, Charley has seen her before during that same event, but the Doctor doesn't know that. "And it's a more permanent body than that." He doesn't bother going into the technobabble of it.

"Oh, speaking of sharing faces, there's two other people with mine here, too," he adds suddenly. It would probably be a bit strange for her to walk up to that Peter guy and start a conversation. At least Andrew would recognise her.