Apart from acting being in his blood (his aunt, father, mother and brother all had theatrical careers), he gained experience at the Old Vic, Dundee Rep (performing in 35 plays in 2 years) and London Academy of Music and Dramatic Art.
Culver has appeared in several television series in recurring roles, as Squire Armstrong in The Adventures of Black Beauty, Major Erwin Brandt in the BBC drama Secret Army, crooked banker Ralph Saroyan in the second series of The House of Eliott and the strict Prior Robert ('Brother Prior') in Cadfael.
His guest roles include an episode of The Professionals' as Lawson, Miss Marple "The Moving Finger" as Edward Symmington and as Sir Reginald Musgrave, in the episode "The Musgrave Ritual" in the Granada Television series The Return of Sherlock Holmes.
He appeared as Captain Needa in The Empire Strikes Back and played a major part in A Passage to India as a bigoted police inspector. In 2008, he appeared in a guest role in Sidetracked, the first episode of Wallander. Culver was also in the first ever episode of New Tricks in 2003 as a corrupt dinosaur detective.
He performed in three of Tricycle Theatre’s Tribunal Plays: Nuremberg (A distillation of the 1945-46 Nuremberg Trials - of leading Nazi war criminals); Half the Picture (From transcripts from the Scott Inquiry into Arms-to-Iraq - the first play to be performed in the Palace of Westminster.) and The Colour of Justice (The dramatisation of the evidence given during Sir William Macpherson’s inquiry into the murder of Stephen Lawrence, his family's search for justice and endemic racism in the police force). They were directed by Nicolas Kent. The Colour of Justice and Half the Picture and were broadcast by the BBC Television.