Cult
Rex Features
The Sun says that the Gavin & Stacey star was spotted on a train learning lines for the show while en route to the set in Cardiff.
A show insider is quoted as saying: "We normally keep our guest stars under wraps but you can't hide a bloke like James.
"And now he's not coming to Wales for Gavin & Stacey anymore, it's pretty obvious why he is here. James loves coming to Wales. And it gives him a chance to meet up with Ruth Jones, who co-wrote Gavin and Stacey with him and starred as Nessa."
The source added: "We're just delighted to have James on board. He is a great actor and he'll be a perfect fit for the new Doctor Who."
This morning, show officials refused to confirm or deny the story, telling DS: "We do not comment on casting or storyline speculation."
> Tube Talk: The new 'Who' trailer in case you missed it
Related Stories
Tube Talk
'Bedlam': On set for the new seriesTube Talk takes a trip to the Bedlam set and speaks with star Lacey Turner.
TV Interviews
'Mike and Molly' Reno Wilson Q&ADigital Spy chats to Reno Wilson about Mike and Molly's wedding and beyond.
TV Ratings
'The Apprentice' final hires nearly 7mEarlier, the BBC's coverage of the Diamond Jubilee entertains more than 10m.
TV Recaps
'Homeland' finale: Have your sayHomeland's incredible finale is reviewed by Digital Spy. Share your verdict.
