Two rival gangs are trying to fix horse races and a jockey is attacked and left for dead in a stage-managed car crash. An insurance investigator makes routine enquiries into the "accident" and one of the gang leaders feels threatened by this and takes counter measures.

Hancock's Half Hour is a BBC radio comedy, and later television comedy, series of the 1950s and 60s written by Ray Galton and Alan Simpson. The series starred Tony Hancock, with Sid James; the radio version also co-starred, at various times, Moira Lister, Andrée Melly, Hattie Jacques, Bill Kerr and Kenneth Williams. The final television series, renamed simply Hancock, starred Hancock alone. Comedian Tony Hancock starred in the show, playing an exaggerated and much poorer version of his own character and lifestyle, Anthony Aloysius St John Hancock, a down-at-heel comedian living at the dilapidated 23 Railway Cuttings in East Cheam. The series was influential in the development of the situation comedy, with its move away from radio variety towards a focus on character development.