The Tardis is being completely redesigned in time for the arrival of the new Doctor Who.

BBC bosses have given the green light to completely refit the interior for a radical new look.

They will also improve the quality of the police box exterior for the opening episode featuring new Time Lord Matt Smith.

Production sources say the decision is being taken by new Doctor Who writer and executive producer Stephen Moffat, who wants to distance himself from previous show chief Russell T Davies.

He wants the arrival of Matt Smith to signify a new era, and also to withstand Doctor Who being in high definition. A source said: "It will be the most hitech, intricate Tardis ever."

Smith, 26, who will become the 11th Time Lord next year, will be the youngest actor to play the 903-year-old doctor.