Desmond Cullum-Jones
From Tardis Wiki, the free Doctor Who reference
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Desmond Cullum-Jones (1 December 1924-6 June 2002[1]) played a worker in the Doctor Who serial The War Machines. He had an uncredited role as a citizen of Millennius in The Keys of Marinus. (DWM 310)
He was supposed to play a commissionaire in The Web of Fear, but the part was dropped in rewrites. (DWM 235)
He was also known for being a "back row" platoon member (commonly referred to as Private Desmond) in the BBC sitcom Dad's Army.