S3, E21: Angered by a noisy motor bike gang who ride on their land, elderly sisters Cynthia and Ermyntrude Peck, who claim to be witches, cast a spell which causes all the motor-bikes to stall. Not only that but almost every electronic and mechanical object in the area also tends to malfunction. Mrs. Gale in her leathers joins the gang to ask permission from the sisters to ride on their property and in the process discovers that these two sweet old dears may actually be in possession of a sophisticated long range jamming device. They may have built a better mouse-trap but it will cause some unsavoury types to beat a path to their door.