We dont have a biography for Harold Siddons
1963The Human Jungle (1 Episode) as Cutler
1963The Wrong Arm of the Law as Police Constable in Garage (uncredited)
1962The Piper's Tune as The Sergeant
1959Danger Within as Capt. 'Tag' Burchnall
1958A Night to Remember as Second Officer Herbert Stone
1958The Silent Enemy as Army Interrogation Officer
1957The Mark of the Hawk as 1st Officer
1957Man in the Shadow as Colin Wells
1956The Last Man to Hang as Cheed's Doctor
1956The Baby and the Battleship as Whiskers
1955I Am a Camera as Editor at Party
1955The Dam Busters as Group Signals Officer
1954The Purple Plain as Injured Navigator (uncredited)
1954Conflict of Wings as Flt. Lt. Edwards
1954The Good Die Young as Hospital Doctor
1954They Who Dare as Lieutenant Stevens
1953The Clue of the Missing Ape as Navy Intelligence Officer
1953Malta Story as Matthews
1953Genevieve as Policeman (Uncredited)
1953Appointment in London as Saunders
1952Gift Horse as Adm. Bartlett
1952Angels One Five as Mortimer, Pimpernel Pilot