sentences:  Wallis appeared in a number of television programmes including "Chelmsford 123", "Doctor at Large" (1971), ITV's production of "The Secret Diary of Adrian Mole", the BBC's adaptation of John Masefield's book "The Box of Delights" (1984), the first series of "Blackadder" (drunken knight), "Blackadder II" (Ploppy the Gaoler), "Blackadder Goes Forth" (Agent Brigadier Smith), "Just Good Friends" (A. J. Styles) and "Yes, Prime Minister".One longstanding role was that of the hard-drinking Dr Nick McKenzie in the BBC drama "Dangerfield", from 1995 until 1998.He appeared as Gestapo-man Werner Beck in award-winning "War and Remembrance" (1988).