Planting a syringe full of anti-abortion vaccine into a farmer's backside creates something of a crisis for Tristan. Farmer Nat Briggs is convinced that his chances of starting a family have been ruined by Tristan's clumsiness, and he hangs threateningly around the Drovers waiting for a chance to confront Tristan. But it is Siegfried who gets a letter threatening court action. James, meanwhile, keeps Helen guessing about his mysterious visits to a local joiner, whose pet, Helen knows, died some time ago.

Queen Elizabeth II's Coronation is cause for Darrowby celebrations on a grand scale. James and Helen's 12-year-old daughter, Rosie, is due to be crowned, too -- as Darrowby's pageant princess -- by her reluctant elder brother, Jimmy. But a severe cough could put a fast end to her starring role in the festivities. Helen is keen to try Mrs. Alton's herbal remedy, but James tells her to give penicillin a chance first. Siegfried also resorts to traditional cures when he tackles a sheep with liver fluke, and is all too eager to pass on to James a rather smelly problem afflicting a dog called Wolfie.