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Doctor Who is facing his biggest battle yet - against custard creams.

Lead star Peter Capaldi has reportedly been banned from eating the biscuits after taking a fancy to them during fiming.

Co-star Jenna Coleman - who plays his sidekick Clara Oswald - is allegedly the person responsible for getting the actor hooked.

Producers are believed to have got worried when the brunette asked catering to order heaps of the treats for the cast.

(Image: BBC)

Bosses have since panicked about the stars' diets and ordered the snacking to stop.

However sneaky Jenna isn't prepared to go cold turkey just yet.

A source told The Daily Star: "They've been taken off the menu but Jenna keeps an emergency packet in her dressing room."

The BBC have denied that biscuits are not allowed.

(Image: BBC)

Jenna might not have to worry about her secret stash any longer as she's rumoured to be getting killed off.

Peter Capaldi recently put sci-fi fans on tender hooks when he suggested his sidekick might be meeting her maker.

He told Doctor Who News: "The thing that is tricky about the Doctor and his relationship with companions. You know, Christopher Eccleston said in his first episode, 'I can see… everything. All there has ever been and all there ever will be. And that drives me mad'.

"So in a way, the Doctor knows the fate of all of his companions. That makes it… difficult. But [with Clara] he is deliberately enjoying the relationship and this great toy box of time and space that they can explore together. But of course, as it’s Doctor Who, there is an ever deepening shadow pursuing them.”