David Tennant was a guest on the Late Show with David Letterman which was broadcast in the US last night.

The actor was promoting his new series Gracepoint but it wasn’t long before the conversation turned to another of his roles for which he is acclaimed, as the Doctor in Doctor Who…

“I’m the Tenth Doctor,” he explained. “Peter Capaldi is the Doctor at the moment. It’s a bit like being the President. You’re always the Doctor. My father in law was the fifth, which confuses people.”