Freema Agyeman who played Martha Jones in Doctor Who and Torchwood was interviewed on Graham Nortons BBC Radio 2 show and revealed that the door is always open for a future appearance in Doctor Who or Torchwood.

Freema  appeared in series 3 and 4 of Doctor Who and Torchwood series 2, and said: “In the 5 part series Children of Earth, it was mentioned that I was on my honeymoon somewhere, so it’s not a closed door, it never is in a series like that, for any of the characters. Once you’re part of that world it could be twenty, forty years before you pop your head back in!”