All Creatures Great & Small - Series Four continues the story of James Herriot (Christopher Timothy), his wife Helen (now played by Linda Bellingham) and his volatile but warm-hearted partner, Siegfried Farnon (Robert Hardy). The setting is now the early Fifties, and the Dales are still suffering from the bleak austerity that gripped all England after World War II. Now that Tristan (Peter Davison) has landed an exalted position in the Ministry of Agriculture and Fisheries, the Darrowby practice recruits a young Scottish vet Calum (John McGlynn), who arrives by motorcycle with a badger in his luggage.