Dr. Finlay's Casebook S07 E04 Pastures New

Mistress Niven, the local gossip and an unqualified nurse, is about to run into serious trouble with Dr. Finlay for endangering the life of a child by treating him unofficially and diagnosing incorrectly. Because there is no way Finlay can resort to law he sends Janet with a very scathing letter, which unfortunately never gets delivered.