He portrayed the villainous founder of Time Lord society, Rassilon, in several Doctor Who audio plays, and also appeared as "The President (of Great Britain)" (on a Parallel World) in the Doctor Who (2006) episode "Rise of the Cybermen".
In a further development of the concept, the Big Finish Productions audio play Neverland written by Alan Barnes, makes mention of 'The Knights of St John the Beheaded' whose Earthly myths make reference to the Gallifreyan legends of Rassilon and his battle with the beast Zagreus.