David Acton

as Duncan

as Anthony Belmont (1 episode)

as Richard

as Mr. Richards (1 episode)

as Sir James Clark Ross

as Count Waldstein

as Count Waldstein (6 episodes)

as BBC Radio Reporter

as Judge (1 episode)

as Malcolm (voice) (1 episode)

as Alistair (1 episode), as Alastair (1 episode)