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Actor David Tennant is starring in the new film, St Trinian's 2: The Legend of Fritton's Gold, alongside Girls Aloud's Sarah Harding and actor Gemma Arterton.

The star reveals he plays the bad guy Lord Pomfrey in the film and he admits he shed a few tears when Doctor Who came to an end.

How did you come to be in St Trinian's the sequel?

That is - but the critics didn't exactly love it...

Why do you think that is?

You've got grey hair for this film?

So what does your character have to do?

Do you have any stunts?

Where you mates with Rupert Everett?

And Doctor Who - have you finished and did you cry?

Are you quite reflective about it?

Will you be watching it at Christmas?

St Trinian's 2: The Legend of Fritton's Gold is in cinemas from December 18.