The Doctor's special effects man

On Earth-33⅓, the Sixth Doctor told Peri Brown that he reconsidered his belief that entering the world of radio could lead to big things upon meeting their special effects man. When the Doctor took Peri to Beeb House to show him to her, he was producing the noise of a trotting horse by bashing coconuts together in Studio 1B. (COMIC: Doctor Who? 178)