Lamont's other credits included roles on H.G. Wells' Invisible Man, The Adventures of Robin Hood, Danger Man, Z-Cars, No Hiding Place, Gideon's Way, Man in a Suitcase, The Avengers, Department S, Randall and Hopkirk (Deceased), The Persuaders!, Crown Court, Doctor in Charge and Secret Army. He also played Station Sergeant Cooper on Dixon of Dock Green, but is best known for playing infected astronaut Victor Carroon in The Quatermass Experiment. He died during filming of the Blake's 7 episode "Hostage"; actor John Abineri (who also appeared in Death to the Daleks) replaced him.