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David Tennant seems determined to help fans avoid spoilers about the Doctor Who 50th anniversary - going so far as to cover his mouth with his phone as he chats on the phone in the first pics taken during the filming of the special episode.

One thing that his - or Joanna Page's - jacket can't hide however is the Gavin & Stacey star's Elizabethan-style costume and red hair.

Could the Tudor monarch be making a third appearance in an episode of Doctor Who, after her previous portrayals by actresses Vivienne Bennett (in 1965 serial 'The Chase') and Angela Pleasance (in 'The Shakespeare Code' from 2007)?

Also, check out the TARDIS being constructed on the Neath, South Wales location. Isn't the inconic police box spacecraft supposed to 'bigger on the inside'?

There's also an off-duty Zygon evident - incidentally, David Tennant's favourite Who monster - coming just hours after it was confirmed that the alien race that tried to conquer Earth after crash-landing into Loch Ness would be making a return.

Tennant, Page, Billie Piper and John Hurt have all been confirmed for the special episode in November, with the first script read through taking place at a secret location earlier this week.

The rehearsals saw Time Lords Matt, 30, and Tennant, 41, working together for the first time.

Ex Doctor Who producer Phil Collinson has admitted he is “beyond excited” about the possibility of previous Time Lord actors appearing together in the feature-length instalment, despite Sylvester McCoy claiming that he has heard nothing from the BBC about the venture.

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In an interview with denofgeek.com, the seventh Doctor denied that there had been any kind of approach, saying: “Somebody mentioned something that the BBC is running on the weekend when it goes out.

“Big Finish [an audiobook company] have done us proud, they're coming out with something really exciting.

“The BBC, we've heard nothing though.”

(Image: BBC)

Speaking earlier this week as she flew back in from America after a promotional tour, current companion Jenna-Louise Colman revealed that the feature-length episode would focus on the future of the show, as well as its past.

She said: “We start filming it next week. I just got a new draft through, which I’ll read in the plane on the way back.

“It’s completely paying homage to the last 50 years without dwelling on anything.

“It’s very much about looking forward while celebrating the legacy.”

The special episode will be shot in 3D as well as HD and shown in cinemas around the world at the same time as it is screened on BBC1.

For more on what Whovians can expect for Doctor Who's 50th celebrations, read Matt Goddard's round-up.