More from Who's Round, Toby Hadoke's Doctor Who 50th anniversary quest to get an anecdote about every single episode of Doctor Who to date. In this instalment, Toby chats to a man sometimes referred to as potato head.

Toby talks vocal inflections, tongue action and size with a performer who has become a much-loved part of the new series' furniture.

Nominated charities: Leonard Cheshire and Compaid

If you have any comments for Toby, or know someone connected to Doctor Who that he could interview, drop him a note via [email protected]