It was back to square one for Doctor Who stars Peter Capaldi and Jenna Coleman as they posed for pictures ahead of the new series.

The pair were in Parliament Square, central London - complete with a giant dinosaur skull - after completing a round-the-world publicity tour that has seen them visit seven cities in seven days including Seoul, Sydney, New York and R io de Janeiro.

Capaldi's first full episode as the Time Lord, Deep Breath, will be shown on BBC One tomorrow (August 23) and sees him transported to Victorian London where a dinosaur is running rampant.

The actor said his version of the Doctor will restore the show's sense of "mystery".

Speaking on Chris Evans' Radio 2 Breakfast Show, he said: "It's difficult with a show that's 50 years old but I thought it would be nice to get some mystery back into it."

He said: "It had become very sort of friendly, user-friendly, which is lovely, but I always thought when I grew up Doc tor Who was a slightly spooky, weird character who would arrive out of nowhere and take people off deep into space and give them terrible, terrifying adventures and I wanted to evoke a bit of that."