[3][4] Richfield played regular guest roles in the 1960s spy series The Avengers, frequently cast as a villain.

[5] Richfield's other television roles include: R3, 199 Park Lane, Gideon's Way, Danger Man, Dixon of Dock Green, Z-Cars, Adam Adamant Lives!, The Baron, Champion House, Out of the Unknown, The Owl Service, UFO, Bergerac, Crossroads, Harriet's Back in Town, Doctor Who (The Sea Devils), Crown Court (TV series), ('Royalties' episode), and The Twin Dilemma), and All Creatures Great and Small.

[7] He alo appeared in Scotland Yard and in The Dark Stairway playing Joe Lloyd.

While they were both playing in repertory Richfield met the actress Valerie Jeanne Wilkinson (1931–2005), known by her stage name of Jan Holden.

The couple had three children together: twin girls, one of whom died from a brain tumour, and a boy, Simon.