"Who Peter" is an obvious pun which has been otherwise used by Blue Peter and Doctor Who for cross-promotion. In the BBC Wales era alone, it has been at least twice used to describe various Blue Peter competitions involving Doctor Who. For instance, it was the name of the event which landed Blue Peter viewer, John Bell, a role in Utopia. It was also the — arguably unofficial — name of the competition to design a TARDIS console that was seen in series 5.