Peter Capaldi on the new Doctor Who companion: "We haven’t chosen someone yet... we're looking for someone different"

Speaking exclusively to RadioTimes.com at the Radio Times Covers Party, he said: "We’ve just had some brief talks about it, we haven’t actually chosen someone yet — that I know of. Perhaps someone has been chosen but I would expect that I would meet them before we finalised all that.

"So we’re looking for someone different," he added with a mysterious smile, lingering on that last word...

But while Capaldi is clearly excited by the prospect of a new and "different" companion, he also revealed that one of his favourite — and most taxing — episodes to film was Heaven Sent, where he acted entirely alone.

"The one where I was on my own was quite challenging because I thought people would get tired of my face and all my tricks. But in a way it was great to do an episode — I mean this in the nicest possible way —with no other actors because it meant I became very much closer with the crew.

The crew are fantastic and I have a great relationship with them anyway, but to be with them all the time was lovely."