AKA Edgar Wallace Mysteries: Never Back Losers
Based on the novel "The Green Ribbon"

IMDb Page

Stan plays the Police Sergeant. Also starring Jack Hedley, Jacqueline Ellis, Patrick Magee, Richard Warner & Derek Francis

Wally Sanders, a horseracing jockey, loses a race and crashes his car to claim an insurance. Jim Matthews, a shrewd and energetic insurance investigator, follows up the company's suspicion of foul play and stumbles deep into a web of corruption concering fixed horse races.