Exactly 20 years ago today, it was announced that David Tennant had been cast as the Tenth Doctor in Doctor Who, and to mark the occasion we've dug out some classic, unseen photos from the Radio ...

The images include photos of Tennant's Doctor alongside his companions Rose Tyler (Billie Piper) and Sarah Jane Smith (the late Elisabeth Sladen). K9, a Dalek and some other alien creatures can ...