Series 4 (1988) After an eight-year break, the opening credits get a makeover from the last series. Whereas previously it was only Siegfried and James featured, now each central character that appears in the episode receives an isolated shot (taken directly from the episode) with their textual introduction. The opening credits for Series 5 are the same. Lynda Bellingham now joins the cast as Helen.
No. Title Original air date
1 "One of Nature's Little Miracles" 17 January 1988
Siegfried decides the time has come to hire a full-time assistant, and Calum Buchanan, with whom Tristan attended veterinary school in Edinburgh, fits the bill. Tristan is now a full-time employee of the Ministry of Agriculture, where he sets his eyes on Deirdre McEwan. James tries to get a bank loan, joins the Milk Sub-Committee and pays a visit to Tricki-Woo. Another vet, Hilary Mottram, claims that Siegfried is stealing his clients.
Characters: Calum Buchanan (first appearance), Mrs Pumphrey, Hilary Mottram, Hodgekin, Mrs Greenlaw, Jimmy Herriot, Rosie Heriot, Deirdre McEwan, Bert Kealey, Mrs Kealey, Mr Buckle, Billy Buckle, Mr Ripley, Mr Fellowes, Mr Lumsden, Mr Carter, Mr Gregson, Sir William Massingham.