Billie Piper, who is well known for her portrayal of Rose Tyler in Doctor Who, recently appeared as a guest on BBC Radio One's Scott Mills show and on the programme, she was interviewed. During the interview, she discussed rumours regarding the possibility of a Doctor Who movie, her thoughts about the casting of Matt Smith as the 11th Doctor and much more. You can listen to extracts from this interview here on Blogtor Who. David Tennant and Catherine Tate also made appearances on the radio yesterday when they both filled in for Jonathan Ross while he was absent from the recording studio. Their appearance was on BBC Radio 2 and guests who they interviewed include; Anthony Head, Ricky Gervais and La Roux. You can listen to their radio presenting here on BBC iPlayer while it's available for a limited amount of time. What do you think of these radio appearances?