Billie Hints at Who Movie?

Billie appeared on Radio 1 last week where she spoke to Sara Cox not only about the new series of Secret Diary of a Call Girl, but her time as Rose Tyler too! During the interview she added yet more fuel to the fire regarding a possible Doctor Who film!
When asked if there was any truth behind the speculation, the actress, rather suprisingly, said: “Well, I’ve heard that they’re doing it and that they want David to do it, but I think he’s slightly anxious that there’ll be big American producers on board and that they’ll try and hijack the whole thing and cast someone like Johnny Depp.”
However, she cooly denied that she would be appearing in it herself, labelling her sudden outbreak of laughter as ‘a nervous twitch’, before insisting: “I don’t know!”
A movie has been on the cards for years now, however the rumours were rekindled last May when ‘DOCTOR WHO - THE MOVIE’ briefly appeared on the agency profile for Russell T Davies, and then, a week later, BBC Films announced that the script for a feature-length adventure was ’in development’. Does Billie know more than she’s letting on?