The teacher Jim Osgood is an advocate for iron discipline at the school in Ashfordly and does not abstain from corporal punishment. PC Mason gets involved when Osgood treats the pupil Gary Bell so rough he ends up in hospital. But Mason's hands are tied because neither the boy nor his parents will make a complaint. Furthermore Osgood attacks his colleague Wendy Kelshaw for rejecting him and intimidates her into silence. Oscar, Alf and Bernie are organizing a trip to London for the entire village. But Aunt Peggy is short of cash and sees no reason to go. Things do not get any better when she finds the tramp Ernie Dunn dead in her barn.