The British TV series 'All Creatures Great and Small' was a compilation of the first two novels by which author?

All Creatures Great and Small is a British television series based on the books of the British veterinary surgeon Alf Wight, who wrote under the pseudonym James Herriot. In 1977, the BBC tasked producer Bill Sellars with the creation of a television series from Herriot's first two novels, If Only They Could Talk and It Shouldn't Happen to a Vet, using the title of the 1975 film adaptation. The Herriot novels were written in an episodic style, with each chapter generally containing a short story within the ongoing narrative of Herriot's life. This format greatly facilitated their adaptation for a television series.

The series had two runs: the original (1978 to 1980, based directly on Herriot's books) was for three series; the second (1988 to 1990, filmed with original scripts) for four. Ninety episodes were broadcast in the six-year period.

Set in the Yorkshire Dales, beginning in the mid-1930s, it stars Christopher Timothy as Herriot, Robert Hardy as Siegfried Farnon, the proprietor of the Skeldale House surgery, and Peter Davison as Siegfried's "little brother", Tristan. Herriot's wife, Helen, was played by different actresses in each of the series' runs: Carol Drinkwater originally, then Linda Bellingham for the revival.