And she said the song she performs on the show could later be released as a single.

The singer has previously explained that the guest spot came about after a chance meeting with the show's production team which led to an invite.

She said: "It feels mental, because it's such an iconic show and I don't think they've really had musicians on the show in the past.

"I got to go into the Tardis, which was exciting. I sound like a proper geek now, but all the controls in the Tardis actually move. So it's real!"