'Mandrake' by Roger Marshall

When Steed attends the funeral of a retired agent held in Cornwall, he notices an unusually high number of recent burials for such a small, almost deserted village. He and Mrs. Gale investigate, and uncover a murder-for-hire scheme by ‘Mandrake Investments’, who arrange for the corpses of poisoned victims to be buried in the churchyard, which is located near a disused tin mine; the heavy arsenic-level of the soil will prevent any possible exhumations and post-mortems from finding anything unusual...

Patrick Macnee (John Steed), Honor Blackman (Cathy Gale), Philip Locke (Roy Hopkins), John Le Mesurier (Doctor Macombie), George Benson (Reverend Wyper), Annette Andre (Judy), Jackie Pallo (Sexton), Madge Ryan (Mrs. Turner), Robert Morris (Benson)

Directed by Bill Bain
Produced by John Bryce

TX:
UK: 25th January, 1964

Notes:
*Featuring John Steed and Mrs. Cathy Gale

*In her graveyard fight scene with wrestler Jackie Pallo, Honor Blackman really does knock him out when she kicks him in the face! He was apparently unconscious for seven and a half minutes...