Psychomania aka The Death Wheelers on VHS. Starring George Sanders, Beryl Reid, Nicky Henson. Directed by Don Sharp. 1973.
From the VHS box:
Violence, excitement and a complete disregard for the conventions of society — this is the way of life for a group of motorbike riders who call themselves “The Living Dead.”
Leader of the gang is Tom, whose mother is a medium holding seances in her home. Together with a sinister butler, Tom’s mother exercises a strange communion with the dead. Through her, Tom learns a terrible secret — how to cross over the barrier between life and death. He suggests to his fellow riders that they put this new-found knowledge to the test.
One by one, they choose their own way to commit suicide with a difference — for each is certain he will arise from the dead.
At a secret place, a Druid’s circle of seven stones called “The Seven Witches,” the members of the gang return. Or do they? Is the butler really a domestic in a mystical household, or is he in reality Satan himself?
“Psychomania” is a powerful drama of the supernatural, the occult, and the violence which lies just beyond the conventions of society.
DVD upgrade: Psychomania