John Leeson has shared more of his experience of acting in Doctor Who - and welcomed the appointment of Jodie Whittaker.
The actor joined the series in the 1970s, becoming the voice of the intelligent dog-robot K9 who served as a companion to the Fourth Doctor (portrayed by Tom Baker).
The actor phoned into talkRADIO for a chat with our host, saying his famous role had originally been a "one-off."
He said: "I was booked as a one-off but now, 40 years later, I’m still playing K9 occasionally.
"Tom Baker was a fan of the character, but the technical difficulties in the studio took up a lot of time and the clock is king.
"I used to run around on all fours being K9 in rehearsal, so the actors could see where he was supposed to be at one time."
He also revealed K9 would respond well to a female doctor, in the wake of Jodie Whittaker being cast as the next Time Lord.
Leeson said the appointment was "absolutely wonderful. The character of a doctor is not gender-specific in any way. The character's an archetype [of a] space and time wanderer. It could be anybody."